Add GitHub CI workflow

By using a std::string_view for LogMetaData strings we avoid an implicit
memory allocation when passing __file__, etc. which are char const*
(notice this is also the case for the standardized
std::source_location::file_name etc).

.github/workflows/ci.yml

@@ -0,0 +1,85 @@
+name: CI
+
+on:
+  push:
+    branches: [ master, dev ]
+  pull_request:
+    branches: [ master, dev ]
+
+jobs:
+  build-linux:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        fedora: [38, 39, 40]
+        include:
+          - fedora: 38
+            gcc: 13
+          - fedora: 39
+            gcc: 13
+          - fedora: 40
+            gcc: 14
+
+    container: ghcr.io/fairrootgroup/fairmq-dev/fedora-${{ matrix.fedora }}
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Install additional dependencies
+      run: |
+        dnf install -y fmt-devel || true
+
+    - name: Configure
+      run: |
+        cmake -B build -G Ninja \
+          -DCMAKE_BUILD_TYPE=RelWithDebInfo \
+          -DDISABLE_COLOR=ON \
+          -DUSE_EXTERNAL_FMT=ON \
+          -DUSE_BOOST_PRETTY_FUNCTION=ON
+
+    - name: Build
+      run: cmake --build build
+
+    - name: Test
+      run: |
+        cd build
+        ctest -V --output-on-failure
+
+  build-macos:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [macos-13, macos-14, macos-15]
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Cache Homebrew packages
+      uses: actions/cache@v4
+      with:
+        path: |
+          ~/Library/Caches/Homebrew
+          /usr/local/Homebrew/Library/Taps
+        key: ${{ runner.os }}-${{ matrix.os }}-brew-${{ hashFiles('.github/workflows/ci.yml') }}
+        restore-keys: |
+          ${{ runner.os }}-${{ matrix.os }}-brew-
+
+    - name: Install dependencies
+      run: |
+        brew install cmake ninja boost fmt
+
+    - name: Configure
+      run: |
+        cmake -B build -G Ninja \
+          -DCMAKE_BUILD_TYPE=RelWithDebInfo \
+          -DDISABLE_COLOR=ON \
+          -DUSE_EXTERNAL_FMT=ON \
+          -DUSE_BOOST_PRETTY_FUNCTION=ON
+
+    - name: Build
+      run: cmake --build build
+
+    - name: Test
+      run: |
+        cd build
+        ctest -V --output-on-failure

.gitignore

@@ -1,2 +1,3 @@
 build/
 .vscode
+install/

CMakeLists.txt

@@ -1,5 +1,5 @@
 ################################################################################
-# Copyright (C) 2018-2021 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH  #
+# Copyright (C) 2018-2024 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH  #
 #                                                                              #
 #              This software is distributed under the terms of the             #
 #              GNU Lesser General Public Licence (LGPL) version 3,             #
@@ -7,7 +7,7 @@
 ################################################################################
 
 cmake_minimum_required(VERSION 3.9.4 FATAL_ERROR)
-cmake_policy(VERSION 3.9...3.19)
+cmake_policy(VERSION 3.9...3.30)
 
 # Project ######################################################################
 set(CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake)
@@ -16,7 +16,7 @@ include(FairFindPackage2)
 
 get_git_version()
 
-project(FairLogger VERSION ${PROJECT_VERSION} LANGUAGES C CXX)
+project(FairLogger VERSION ${PROJECT_VERSION} LANGUAGES CXX)
 message(STATUS "${BWhite}${PROJECT_NAME}${CR} ${PROJECT_GIT_VERSION} from ${PROJECT_DATE}")
 
 set_fairlogger_defaults()
@@ -54,7 +54,7 @@ add_library(FairLogger
   logger/Logger.cxx
   logger/Logger.h
 )
-target_compile_features(FairLogger PUBLIC cxx_std_14)
+target_compile_features(FairLogger PUBLIC cxx_std_17)
 
 if(USE_BOOST_PRETTY_FUNCTION)
   target_link_libraries(FairLogger PUBLIC Boost::boost)

FairLoggerTest.cmake

@@ -15,14 +15,10 @@ set(CTEST_USE_LAUNCHERS ON)
 set(CTEST_CONFIGURATION_TYPE "RelWithDebInfo")
 
 if(NOT NCPUS)
-  if(ENV{SLURM_CPUS_PER_TASK})
-    set(NCPUS $ENV{SLURM_CPUS_PER_TASK})
-  else()
-    include(ProcessorCount)
-    ProcessorCount(NCPUS)
-    if(NCPUS EQUAL 0)
-      set(NCPUS 1)
-    endif()
+  include(ProcessorCount)
+  ProcessorCount(NCPUS)
+  if(NCPUS EQUAL 0)
+    set(NCPUS 1)
   endif()
 endif()
 
@@ -32,10 +28,10 @@ else()
   set(CTEST_SITE $ENV{CTEST_SITE})
 endif()
 
-if ("$ENV{LABEL}" STREQUAL "")
+if ("$ENV{CTEST_BUILD_NAME}" STREQUAL "")
   set(CTEST_BUILD_NAME "build")
 else()
-  set(CTEST_BUILD_NAME $ENV{LABEL})
+  set(CTEST_BUILD_NAME $ENV{CTEST_BUILD_NAME})
 endif()
 
 ctest_start(Continuous)

Jenkinsfile

@@ -1,74 +0,0 @@
-#!groovy
-
-def jobMatrix(String prefix, String type, List specs) {
-  def nodes = [:]
-  for (spec in specs) {
-    job = "${spec.os}-${spec.ver}-${spec.arch}-${spec.compiler}"
-    def label = "${type}/${job}"
-    def selector = "${spec.os}-${spec.ver}-${spec.arch}"
-    def os = spec.os
-    def ver = spec.ver
-    def check = spec.check
-
-    nodes[label] = {
-      node(selector) {
-        githubNotify(context: "${prefix}/${label}", description: 'Building ...', status: 'PENDING')
-        try {
-          deleteDir()
-          checkout scm
-
-          def jobscript = 'job.sh'
-          def ctestcmd = "ctest -S FairLoggerTest.cmake -V --output-on-failure"
-          sh "echo \"set -e\" >> ${jobscript}"
-          sh "echo \"export LABEL=\\\"\${JOB_BASE_NAME} ${label}\\\"\" >> ${jobscript}"
-          if (selector =~ /^macos/) {
-            sh "echo \"${ctestcmd}\" >> ${jobscript}"
-            sh "cat ${jobscript}"
-            sh "bash ${jobscript}"
-          } else {
-            def containercmd = "singularity exec -B/shared ${env.SINGULARITY_CONTAINER_ROOT}/fairlogger/${os}.${ver}.sif bash -l -c \\\"${ctestcmd}\\\""
-            sh """\
-              echo \"echo \\\"*** Job started at .......: \\\$(date -R)\\\"\" >> ${jobscript}
-              echo \"echo \\\"*** Job ID ...............: \\\${SLURM_JOB_ID}\\\"\" >> ${jobscript}
-              echo \"echo \\\"*** Compute node .........: \\\$(hostname -f)\\\"\" >> ${jobscript}
-              echo \"unset http_proxy\" >> ${jobscript}
-              echo \"unset HTTP_PROXY\" >> ${jobscript}
-              echo \"${containercmd}\" >> ${jobscript}
-            """
-            sh "cat ${jobscript}"
-            sh "test/ci/slurm-submit.sh \"FairLogger \${JOB_BASE_NAME} ${label}\" ${jobscript}"
-          }
-
-          deleteDir()
-          githubNotify(context: "${prefix}/${label}", description: 'Success', status: 'SUCCESS')
-        } catch (e) {
-          deleteDir()
-          githubNotify(context: "${prefix}/${label}", description: 'Error', status: 'ERROR')
-          throw e
-        }
-      }
-    }
-  }
-  return nodes
-}
-
-pipeline{
-  agent none
-  stages {
-    stage("Run CI Matrix") {
-      steps{
-        script {
-          def builds = jobMatrix('alfa-ci', 'build', [
-            [os: 'fedora', ver: '32',    arch: 'x86_64', compiler: 'gcc-10'],
-            [os: 'fedora', ver: '33',    arch: 'x86_64', compiler: 'gcc-10'],
-            [os: 'fedora', ver: '34',    arch: 'x86_64', compiler: 'gcc-11'],
-            [os: 'macos',  ver: '11',    arch: 'x86_64', compiler: 'apple-clang-12'],
-            [os: 'macos',  ver: '11',    arch: 'arm64',  compiler: 'apple-clang-13'],
-          ])
-
-          parallel(builds)
-        }
-      }
-    }
-  }
-}

README.md

@@ -68,9 +68,11 @@ A number of additional logging macros are provided:
 - `LOGV(severity, verbosity)` Log the line with the provided verbosity, e.g. `LOG(info, veryhigh) << "abcd";`
 - `LOGF(severity, ...)` The arguments are given to `fmt::printf`, which formats the string using a [printf syntax](https://fmt.dev/dev/api.html#printf-formatting) and the result is logged, e.g. `LOGF(info, "Hello %s!", "world");`
 - `LOGP(severity, ...)` The arguments are given to `fmt::format`, which formats the string using a [Python-like syntax](https://fmt.dev/dev/syntax.html) and the result is logged, e.g. `LOGP(info, "Hello {}!", "world");`
+- `LOGPD(severity, ...)` Same as `LOGP`, but accepts dynamic severity (runtime variable), e.g. `LOGPD(dynamicSeverity, "Hello {}!", "world");`
+- `LOGFD(severity, ...)` Same as `LOGF`, but accepts dynamic severity (runtime variable), e.g. `LOGFD(dynamicSeverity, "Hello %s!", "world");`
 - `LOGN(severity)` Logs an empty line, e.g. `LOGN(info);`
 - `LOG_IF(severity, condition)` Logs the line if the provided condition if true
-- `LOGD(severity, file, line, f)` Logs the line with the provided file, line and function parameters (only if the active verbosity allows it).
+- `LOGD(severity, file, line, f)` Logs the line with the provided file, line and function parameters (accepts severity as a variable), e.g. `LOGD(dynamicSeverity, "main.cpp", "42", "main");`
 
 ## 3. Severity
 
@@ -93,12 +95,14 @@ where severity level is one of the following:
 "debug2",
 "debug1",
 "debug",
+"detail",
 "info",
 "state",
 "warn",
 "important",
 "alarm",
 "error",
+"critical",
 "fatal",
 ```
 
@@ -222,7 +226,7 @@ If only output from custom sinks is desirable, console/file sinks must be deacti
 
 ## Naming conflicts?
 
-By default, `<fairlogger/Logger.h>` defines unprefixed macros: `LOG`, `LOGV`, `LOGF`, `LOGP`, `LOGN`, `LOGD`, `LOG_IF`.
+By default, `<fairlogger/Logger.h>` defines unprefixed macros: `LOG`, `LOGV`, `LOGF`, `LOGP`, `LOGPD`, `LOGFD`, `LOGN`, `LOGD`, `LOG_IF`.
 
 Define an option `FAIR_NO_LOG*` to prevent the above unprefixed macros to be defined, e.g.
 

cmake/FairLoggerLib.cmake

@@ -94,7 +94,7 @@ macro(set_fairlogger_defaults)
   endif()
 
   # Handle C++ standard level
-  set(PROJECT_MIN_CXX_STANDARD 14)
+  set(PROJECT_MIN_CXX_STANDARD 17)
   if(CMAKE_CXX_STANDARD LESS PROJECT_MIN_CXX_STANDARD)
     message(FATAL_ERROR "A minimum CMAKE_CXX_STANDARD of ${PROJECT_MIN_CXX_STANDARD} is required.")
   endif()
@@ -128,8 +128,8 @@ macro(set_fairlogger_defaults)
   list(FIND CMAKE_PLATFORM_IMPLICIT_LINK_DIRECTORIES "${CMAKE_INSTALL_PREFIX}/${PROJECT_INSTALL_LIBDIR}" isSystemDir)
   if("${isSystemDir}" STREQUAL "-1")
     if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
-      list(APPEND CMAKE_EXE_LINKER_FLAGS "-Wl,--enable-new-dtags")
-      list(APPEND CMAKE_SHARED_LINKER_FLAGS "-Wl,--enable-new-dtags")
+      string(APPEND CMAKE_EXE_LINKER_FLAGS " -Wl,--enable-new-dtags")
+      string(APPEND CMAKE_SHARED_LINKER_FLAGS " -Wl,--enable-new-dtags")
       list(APPEND CMAKE_INSTALL_RPATH "$ORIGIN/../${PROJECT_INSTALL_LIBDIR}")
     elseif(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
       list(APPEND CMAKE_INSTALL_RPATH "@loader_path/../${PROJECT_INSTALL_LIBDIR}")

logger/Logger.cxx

@@ -1,11 +1,12 @@
 /********************************************************************************
- * Copyright (C) 2014-2019 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH  *
+ * Copyright (C) 2014-2025 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH  *
  *                                                                              *
  *              This software is distributed under the terms of the             *
  *              GNU Lesser General Public Licence (LGPL) version 3,             *
  *                  copied verbatim in the file "LICENSE"                       *
  ********************************************************************************/
 #include "Logger.h"
+#include <string_view>
 
 #if FMT_VERSION < 60000
 #include <fmt/time.h>
@@ -15,6 +16,7 @@
 
 #include <cstdio> // printf
 #include <iostream>
+#include <iterator> // std::back_inserter
 
 using namespace std;
 
@@ -43,55 +45,59 @@ const string Logger::fProcessName = program_invocation_short_name;
 const string Logger::fProcessName = "?";
 #endif
 
-const unordered_map<string, Verbosity> Logger::fVerbosityMap =
+const unordered_map<string_view, Verbosity> Logger::fVerbosityMap =
 {
-    { "veryhigh", Verbosity::veryhigh },
-    { "high",     Verbosity::high     },
-    { "medium",   Verbosity::medium   },
-    { "low",      Verbosity::low      },
-    { "verylow",  Verbosity::verylow  },
-    { "VERYHIGH", Verbosity::veryhigh },
-    { "HIGH",     Verbosity::high     },
-    { "MEDIUM",   Verbosity::medium   },
-    { "LOW",      Verbosity::low      },
-    { "VERYLOW",  Verbosity::verylow  },
-    { "user1",    Verbosity::user1    },
-    { "user2",    Verbosity::user2    },
-    { "user3",    Verbosity::user3    },
-    { "user4",    Verbosity::user4    }
+    { {"veryhigh"}, Verbosity::veryhigh },
+    { {"high"},     Verbosity::high     },
+    { {"medium"},   Verbosity::medium   },
+    { {"low"},      Verbosity::low      },
+    { {"verylow"},  Verbosity::verylow  },
+    { {"VERYHIGH"}, Verbosity::veryhigh },
+    { {"HIGH"},     Verbosity::high     },
+    { {"MEDIUM"},   Verbosity::medium   },
+    { {"LOW"},      Verbosity::low      },
+    { {"VERYLOW"},  Verbosity::verylow  },
+    { {"user1"},    Verbosity::user1    },
+    { {"user2"},    Verbosity::user2    },
+    { {"user3"},    Verbosity::user3    },
+    { {"user4"},    Verbosity::user4    }
 };
 
-const unordered_map<string, Severity> Logger::fSeverityMap =
+const unordered_map<string_view, Severity> Logger::fSeverityMap =
 {
-    { "nolog",     Severity::nolog     },
-    { "NOLOG",     Severity::nolog     },
-    { "error",     Severity::error     },
-    { "ERROR",     Severity::error     },
-    { "alarm",     Severity::alarm     },
-    { "important", Severity::important },
-    { "warn",      Severity::warn      },
-    { "WARN",      Severity::warn      },
-    { "warning",   Severity::warn      },
-    { "WARNING",   Severity::warn      },
-    { "state",     Severity::state     },
-    { "STATE",     Severity::state     },
-    { "info",      Severity::info      },
-    { "INFO",      Severity::info      },
-    { "debug",     Severity::debug     },
-    { "DEBUG",     Severity::debug     },
-    { "debug1",    Severity::debug1    },
-    { "DEBUG1",    Severity::debug1    },
-    { "debug2",    Severity::debug2    },
-    { "DEBUG2",    Severity::debug2    },
-    { "debug3",    Severity::debug3    },
-    { "DEBUG3",    Severity::debug3    },
-    { "debug4",    Severity::debug4    },
-    { "DEBUG4",    Severity::debug4    },
-    { "trace",     Severity::trace     },
-    { "TRACE",     Severity::trace     }
+    { {"nolog"},     Severity::nolog     },
+    { {"NOLOG"},     Severity::nolog     },
+    { {"fatal"},     Severity::fatal     },
+    { {"FATAL"},     Severity::fatal     },
+    { {"critical"},  Severity::critical  },
+    { {"error"},     Severity::error     },
+    { {"ERROR"},     Severity::error     },
+    { {"alarm"},     Severity::alarm     },
+    { {"important"}, Severity::important },
+    { {"warn"},      Severity::warn      },
+    { {"WARN"},      Severity::warn      },
+    { {"warning"},   Severity::warn      },
+    { {"WARNING"},   Severity::warn      },
+    { {"state"},     Severity::state     },
+    { {"STATE"},     Severity::state     },
+    { {"info"},      Severity::info      },
+    { {"INFO"},      Severity::info      },
+    { {"detail"},    Severity::detail    },
+    { {"debug"},     Severity::debug     },
+    { {"DEBUG"},     Severity::debug     },
+    { {"debug1"},    Severity::debug1    },
+    { {"DEBUG1"},    Severity::debug1    },
+    { {"debug2"},    Severity::debug2    },
+    { {"DEBUG2"},    Severity::debug2    },
+    { {"debug3"},    Severity::debug3    },
+    { {"DEBUG3"},    Severity::debug3    },
+    { {"debug4"},    Severity::debug4    },
+    { {"DEBUG4"},    Severity::debug4    },
+    { {"trace"},     Severity::trace     },
+    { {"TRACE"},     Severity::trace     }
 };
 
-const array<string, 14> Logger::fSeverityNames =
+const array<string_view, 16> Logger::fSeverityNames =
 {
     {
         "NOLOG",
@@ -101,17 +107,19 @@ const array<string, 14> Logger::fSeverityNames =
         "DEBUG2",
         "DEBUG1",
         "DEBUG",
+        "DETAIL",
         "INFO",
         "STATE",
         "WARN",
         "IMPORTANT",
         "ALARM",
         "ERROR",
+        "CRITICAL",
         "FATAL"
     }
 };
 
-const array<string, 9> Logger::fVerbosityNames =
+const array<string_view, 9> Logger::fVerbosityNames =
 {
     {
         "verylow",
@@ -139,12 +147,11 @@ map<Verbosity, VSpec> Logger::fVerbosities =
     { Verbosity::user4,    VSpec::Make(VSpec::Info::severity)                                                                                        }
 };
 
-Logger::Logger(Severity severity, Verbosity verbosity, const string& file, const string& line, const string& func)
+Logger::Logger(Severity severity, Verbosity verbosity, std::string_view file, std::string_view line, std::string_view func)
     : fTimeCalculated(false)
 {
     if (!fIsDestructed) {
         size_t pos = file.rfind("/");
-
         // fInfos.timestamp is filled conditionally
         // fInfos.us is filled conditionally
         fInfos.process_name = fProcessName;
@@ -160,27 +167,27 @@ Logger::Logger(Severity severity, Verbosity verbosity, const string& file, const
             for (const auto info : spec.fInfos) {
                 switch (info) {
                     case VSpec::Info::process_name:
-                        fmt::format_to(fBWPrefix, "[{}]", fInfos.process_name);
+                        fmt::format_to(std::back_inserter(fBWPrefix), "[{}]", fInfos.process_name);
                         break;
                     case VSpec::Info::timestamp_us:
                         FillTimeInfos();
-                        fmt::format_to(fBWPrefix, "[{:%H:%M:%S}.{:06}]", fmt::localtime(fInfos.timestamp), fInfos.us.count());
+                        fmt::format_to(std::back_inserter(fBWPrefix), "[{:%H:%M:%S}.{:06}]", fmt::localtime(fInfos.timestamp), fInfos.us.count());
                         break;
                     case VSpec::Info::timestamp_s:
                         FillTimeInfos();
-                        fmt::format_to(fBWPrefix, "[{:%H:%M:%S}]", fmt::localtime(fInfos.timestamp));
+                        fmt::format_to(std::back_inserter(fBWPrefix), "[{:%H:%M:%S}]", fmt::localtime(fInfos.timestamp));
                         break;
                     case VSpec::Info::severity:
-                        fmt::format_to(fBWPrefix, "[{}]", fInfos.severity_name);
+                        fmt::format_to(std::back_inserter(fBWPrefix), "[{}]", fInfos.severity_name);
                         break;
                     case VSpec::Info::file_line_function:
-                        fmt::format_to(fBWPrefix, "[{}:{}:{}]", fInfos.file, fInfos.line, fInfos.func);
+                        fmt::format_to(std::back_inserter(fBWPrefix), "[{}:{}:{}]", fInfos.file, fInfos.line, fInfos.func);
                         break;
                     case VSpec::Info::file_line:
-                        fmt::format_to(fBWPrefix, "[{}:{}]", fInfos.file, fInfos.line);
+                        fmt::format_to(std::back_inserter(fBWPrefix), "[{}:{}]", fInfos.file, fInfos.line);
                         break;
                     case VSpec::Info::file:
-                        fmt::format_to(fBWPrefix, "[{}]", fInfos.file);
+                        fmt::format_to(std::back_inserter(fBWPrefix), "[{}]", fInfos.file);
                         break;
                     default:
                         break;
@@ -188,7 +195,7 @@ Logger::Logger(Severity severity, Verbosity verbosity, const string& file, const
             }
 
             if (spec.fSize > 0) {
-                fmt::format_to(fBWPrefix, " ");
+                fmt::format_to(std::back_inserter(fBWPrefix), " ");
             }
         }
 
@@ -196,27 +203,27 @@ Logger::Logger(Severity severity, Verbosity verbosity, const string& file, const
             for (const auto info : spec.fInfos) {
                 switch (info) {
                     case VSpec::Info::process_name:
-                        fmt::format_to(fColorPrefix, "[{}]", ColorOut(Color::fgBlue, fInfos.process_name));
+                        fmt::format_to(std::back_inserter(fColorPrefix), "[{}]", ColorOut(Color::fgBlue, fInfos.process_name));
                         break;
                     case VSpec::Info::timestamp_us:
                         FillTimeInfos();
-                        fmt::format_to(fColorPrefix, "[{}{:%H:%M:%S}.{:06}{}]", startColor(Color::fgCyan), fmt::localtime(fInfos.timestamp), fInfos.us.count(), endColor());
+                        fmt::format_to(std::back_inserter(fColorPrefix), "[{}{:%H:%M:%S}.{:06}{}]", startColor(Color::fgCyan), fmt::localtime(fInfos.timestamp), fInfos.us.count(), endColor());
                         break;
                     case VSpec::Info::timestamp_s:
                         FillTimeInfos();
-                        fmt::format_to(fColorPrefix, "[{}{:%H:%M:%S}{}]", startColor(Color::fgCyan), fmt::localtime(fInfos.timestamp), endColor());
+                        fmt::format_to(std::back_inserter(fColorPrefix), "[{}{:%H:%M:%S}{}]", startColor(Color::fgCyan), fmt::localtime(fInfos.timestamp), endColor());
                         break;
                     case VSpec::Info::severity:
-                        fmt::format_to(fColorPrefix, "[{}]", GetColoredSeverityString(fInfos.severity));
+                        fmt::format_to(std::back_inserter(fColorPrefix), "[{}]", GetColoredSeverityString(fInfos.severity));
                         break;
                     case VSpec::Info::file_line_function:
-                        fmt::format_to(fColorPrefix, "[{}:{}:{}]", ColorOut(Color::fgBlue, fInfos.file), ColorOut(Color::fgYellow, fInfos.line), ColorOut(Color::fgBlue, fInfos.func));
+                        fmt::format_to(std::back_inserter(fColorPrefix), "[{}:{}:{}]", ColorOut(Color::fgBlue, fInfos.file), ColorOut(Color::fgYellow, fInfos.line), ColorOut(Color::fgBlue, fInfos.func));
                         break;
                     case VSpec::Info::file_line:
-                        fmt::format_to(fColorPrefix, "[{}:{}]", ColorOut(Color::fgBlue, fInfos.file), ColorOut(Color::fgYellow, fInfos.line));
+                        fmt::format_to(std::back_inserter(fColorPrefix), "[{}:{}]", ColorOut(Color::fgBlue, fInfos.file), ColorOut(Color::fgYellow, fInfos.line));
                         break;
                     case VSpec::Info::file:
-                        fmt::format_to(fColorPrefix, "[{}]", ColorOut(Color::fgBlue, fInfos.file));
+                        fmt::format_to(std::back_inserter(fColorPrefix), "[{}]", ColorOut(Color::fgBlue, fInfos.file));
                         break;
                     default:
                         break;
@@ -224,7 +231,7 @@ Logger::Logger(Severity severity, Verbosity verbosity, const string& file, const
             }
 
             if (spec.fSize > 0) {
-                fmt::format_to(fColorPrefix, " ");
+                fmt::format_to(std::back_inserter(fColorPrefix), " ");
             }
         }
 
@@ -284,12 +291,14 @@ string Logger::GetColoredSeverityString(Severity severity)
     switch (severity) {
         case Severity::nolog:     return "\033[01;39mNOLOG\033[0m";     break;
         case Severity::fatal:     return "\033[01;31mFATAL\033[0m";     break;
+        case Severity::critical:  return "\033[01;31mCRITICAL\033[0m";  break;
         case Severity::error:     return "\033[01;31mERROR\033[0m";     break;
         case Severity::alarm:     return "\033[01;33mALARM\033[0m";     break;
         case Severity::important: return "\033[01;32mIMPORTANT\033[0m"; break;
         case Severity::warn:      return "\033[01;33mWARN\033[0m";      break;
         case Severity::state:     return "\033[01;35mSTATE\033[0m";     break;
         case Severity::info:      return "\033[01;32mINFO\033[0m";      break;
+        case Severity::detail:    return "\033[01;32mDETAIL\033[0m";    break;
         case Severity::debug:     return "\033[01;34mDEBUG\033[0m";     break;
         case Severity::debug1:    return "\033[01;34mDEBUG1\033[0m";    break;
         case Severity::debug2:    return "\033[01;34mDEBUG2\033[0m";    break;

logger/Logger.h

@@ -1,5 +1,5 @@
 /********************************************************************************
- * Copyright (C) 2014-2019 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH  *
+ * Copyright (C) 2014-2025 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH  *
  *                                                                              *
  *              This software is distributed under the terms of the             *
  *              GNU Lesser General Public Licence (LGPL) version 3,             *
@@ -45,6 +45,7 @@
 #include <time.h> // time_t
 #include <type_traits> // is_same
 #include <unordered_map>
+#include <string_view>
 #include <utility> // pair
 
 namespace fair
@@ -59,29 +60,31 @@ enum class Severity : int
     debug2 = 4,
     debug1 = 5,
     debug = 6,
-    info = 7,
-    state = 8,
-    warn = 9,
-    important = 10,
-    alarm = 11,
-    error = 12,
-    fatal = 13,
+    detail = 7,
+    info = 8,
+    state = 9,
+    warn = 10,
+    important = 11,
+    alarm = 12,
+    error = 13,
+    critical = 14,
+    fatal = 15,
     // aliases
     warning = warn,
     // backwards-compatibility
-    NOLOG __attribute__((deprecated("Use LOG(nolog) instead (lowercase severity name)."))) = nolog,
-    FATAL __attribute__((deprecated("Use LOG(fatal) instead (lowercase severity name)."))) = fatal,
-    ERROR __attribute__((deprecated("Use LOG(error) instead (lowercase severity name)."))) = error,
-    WARN __attribute__((deprecated("Use LOG(warn) instead (lowercase severity name)."))) = warn,
+    NOLOG   __attribute__((deprecated("Use LOG(nolog) instead (lowercase severity name)."))) = nolog,
+    FATAL   __attribute__((deprecated("Use LOG(fatal) instead (lowercase severity name)."))) = fatal,
+    ERROR   __attribute__((deprecated("Use LOG(error) instead (lowercase severity name)."))) = error,
+    WARN    __attribute__((deprecated("Use LOG(warn) instead (lowercase severity name)."))) = warn,
     WARNING __attribute__((deprecated("Use LOG(warning) instead (lowercase severity name)."))) = warn,
-    STATE __attribute__((deprecated("Use LOG(state) instead (lowercase severity name)."))) = state,
-    INFO __attribute__((deprecated("Use LOG(info) instead (lowercase severity name)."))) = info,
-    DEBUG __attribute__((deprecated("Use LOG(debug) instead (lowercase severity name)."))) = debug,
-    DEBUG1 __attribute__((deprecated("Use LOG(debug1) instead (lowercase severity name)."))) = debug1,
-    DEBUG2 __attribute__((deprecated("Use LOG(debug2) instead (lowercase severity name)."))) = debug2,
-    DEBUG3 __attribute__((deprecated("Use LOG(debug3) instead (lowercase severity name)."))) = debug3,
-    DEBUG4 __attribute__((deprecated("Use LOG(debug4) instead (lowercase severity name)."))) = debug4,
-    TRACE __attribute__((deprecated("Use LOG(trace) instead (lowercase severity name)."))) = trace
+    STATE   __attribute__((deprecated("Use LOG(state) instead (lowercase severity name)."))) = state,
+    INFO    __attribute__((deprecated("Use LOG(info) instead (lowercase severity name)."))) = info,
+    DEBUG   __attribute__((deprecated("Use LOG(debug) instead (lowercase severity name)."))) = debug,
+    DEBUG1  __attribute__((deprecated("Use LOG(debug1) instead (lowercase severity name)."))) = debug1,
+    DEBUG2  __attribute__((deprecated("Use LOG(debug2) instead (lowercase severity name)."))) = debug2,
+    DEBUG3  __attribute__((deprecated("Use LOG(debug3) instead (lowercase severity name)."))) = debug3,
+    DEBUG4  __attribute__((deprecated("Use LOG(debug4) instead (lowercase severity name)."))) = debug4,
+    TRACE   __attribute__((deprecated("Use LOG(trace) instead (lowercase severity name)."))) = trace
 };
 
 // verbosity levels:
@@ -174,19 +177,19 @@ struct LogMetaData
 {
     std::time_t timestamp;
     std::chrono::microseconds us;
-    std::string process_name;
-    std::string file;
-    std::string line;
-    std::string func;
-    std::string severity_name;
+    std::string_view process_name;
+    std::string_view file;
+    std::string_view line;
+    std::string_view func;
+    std::string_view severity_name;
     fair::Severity severity;
 };
 
 class Logger
 {
   public:
-    Logger(Severity severity, Verbosity verbosity, const std::string& file, const std::string& line, const std::string& func);
-    Logger(Severity severity, const std::string& file, const std::string& line, const std::string& func)
+    Logger(Severity severity, Verbosity verbosity, std::string_view file, std::string_view line, std::string_view func);
+    Logger(Severity severity, std::string_view file, std::string_view line, std::string_view func)
         : Logger(severity, fVerbosity, file, line, func)
     {}
     virtual ~Logger() noexcept(false);
@@ -243,7 +246,7 @@ class Logger
 
     static std::string startColor(Color color) { return fmt::format("\033[01;{}m", static_cast<int>(color)); }
     static std::string endColor() { return "\033[0m"; }
-    static std::string ColorOut(Color c, const std::string& s) { return fmt::format("\033[01;{}m{}\033[0m", static_cast<int>(c), s); }
+    static std::string ColorOut(Color c, std::string_view s) { return fmt::format("\033[01;{}m{}\033[0m", static_cast<int>(c), s); }
     static std::string GetColoredSeverityString(Severity severity);
 
     static void SetConsoleSeverity(const Severity severity);
@@ -284,8 +287,8 @@ class Logger
 
     static void RemoveFileSink();
 
-    static std::string SeverityName(Severity s) { return fSeverityNames.at(static_cast<size_t>(s)); }
-    static std::string VerbosityName(Verbosity v) { return fVerbosityNames.at(static_cast<size_t>(v)); }
+    static std::string_view SeverityName(Severity s) { return fSeverityNames.at(static_cast<size_t>(s)); }
+    static std::string_view VerbosityName(Verbosity v) { return fVerbosityNames.at(static_cast<size_t>(v)); }
 
     static void OnFatal(std::function<void()> func);
 
@@ -321,10 +324,10 @@ class Logger
     Logger& operator<<(std::ios_base& (*manip) (std::ios_base&));
     Logger& operator<<(std::ostream& (*manip) (std::ostream&));
 
-    static const std::unordered_map<std::string, Verbosity> fVerbosityMap;
-    static const std::unordered_map<std::string, Severity> fSeverityMap;
-    static const std::array<std::string, 14> fSeverityNames;
-    static const std::array<std::string, 9> fVerbosityNames;
+    static const std::unordered_map<std::string_view, Verbosity> fVerbosityMap;
+    static const std::unordered_map<std::string_view, Severity> fSeverityMap;
+    static const std::array<std::string_view, 16> fSeverityNames;
+    static const std::array<std::string_view, 9> fVerbosityNames;
 
     // protection for use after static destruction took place
     static bool fIsDestructed;
@@ -391,16 +394,16 @@ inline std::ostream& operator<<(std::ostream& os, const Verbosity& v) { return o
 #undef LOGV
 #define LOGV FAIR_LOGV
 #endif
-// allow user of this header file to prevent definition of the LOGF macro, by defining FAIR_NO_LOGF before including this header
-#ifndef FAIR_NO_LOGF
-#undef LOGF
-#define LOGF FAIR_LOGF
-#endif
 // allow user of this header file to prevent definition of the LOGP macro, by defining FAIR_NO_LOGP before including this header
 #ifndef FAIR_NO_LOGP
 #undef LOGP
 #define LOGP FAIR_LOGP
 #endif
+// allow user of this header file to prevent definition of the LOGF macro, by defining FAIR_NO_LOGF before including this header
+#ifndef FAIR_NO_LOGF
+#undef LOGF
+#define LOGF FAIR_LOGF
+#endif
 // allow user of this header file to prevent definition of the LOGN macro, by defining FAIR_NO_LOGN before including this header
 #ifndef FAIR_NO_LOGN
 #undef LOGN
@@ -416,6 +419,16 @@ inline std::ostream& operator<<(std::ostream& os, const Verbosity& v) { return o
 #undef LOG_IF
 #define LOG_IF FAIR_LOG_IF
 #endif
+// allow user of this header file to prevent definition of the LOGPD macro, by defining FAIR_NO_LOGPD before including this header
+#ifndef FAIR_NO_LOGPD
+#undef LOGPD
+#define LOGPD FAIR_LOGPD
+#endif
+// allow user of this header file to prevent definition of the LOGFD macro, by defining FAIR_NO_LOGFD before including this header
+#ifndef FAIR_NO_LOGFD
+#undef LOGFD
+#define LOGFD FAIR_LOGFD
+#endif
 
 // Log line if the provided severity is below or equals the configured one
 #define FAIR_LOG(severity) \
@@ -430,8 +443,19 @@ inline std::ostream& operator<<(std::ostream& os, const Verbosity& v) { return o
             fair::Logger(fair::Severity::severity, fair::Verbosity::verbosity, MSG_ORIGIN)
 
 // Log with fmt- or printf-like formatting
-#define FAIR_LOGP(severity, ...) LOG(severity) << fmt::format(__VA_ARGS__)
-#define FAIR_LOGF(severity, ...) LOG(severity) << fmt::sprintf(__VA_ARGS__)
+#define FAIR_LOGP(severity, ...) FAIR_LOG(severity) << fmt::format(__VA_ARGS__)
+#define FAIR_LOGF(severity, ...) FAIR_LOG(severity) << fmt::sprintf(__VA_ARGS__)
+
+// Log with fmt- or printf-like formatting (dynamic severity)
+#define FAIR_LOGPD(severity, ...) \
+    for (bool fairLOggerunLikelyvariable3 = false; !fair::Logger::SuppressSeverity(severity) && !fairLOggerunLikelyvariable3; fairLOggerunLikelyvariable3 = true) \
+        for (bool fairLOggerunLikelyvariable = false; fair::Logger::Logging(severity) && !fairLOggerunLikelyvariable; fairLOggerunLikelyvariable = true) \
+            fair::Logger(severity, MSG_ORIGIN) << fmt::format(__VA_ARGS__)
+
+#define FAIR_LOGFD(severity, ...) \
+    for (bool fairLOggerunLikelyvariable3 = false; !fair::Logger::SuppressSeverity(severity) && !fairLOggerunLikelyvariable3; fairLOggerunLikelyvariable3 = true) \
+        for (bool fairLOggerunLikelyvariable = false; fair::Logger::Logging(severity) && !fairLOggerunLikelyvariable; fairLOggerunLikelyvariable = true) \
+            fair::Logger(severity, MSG_ORIGIN) << fmt::sprintf(__VA_ARGS__)
 
 // Log an empty line
 #define FAIR_LOGN(severity) \
@@ -448,6 +472,6 @@ inline std::ostream& operator<<(std::ostream& os, const Verbosity& v) { return o
 #define FAIR_LOG_IF(severity, condition) \
     for (bool fairLOggerunLikelyvariable4 = false; !fair::Logger::SuppressSeverity(fair::Severity::severity) && !fairLOggerunLikelyvariable4; fairLOggerunLikelyvariable4 = true) \
         for (bool fairLOggerunLikelyvariable2 = false; condition && !fairLOggerunLikelyvariable2; fairLOggerunLikelyvariable2 = true) \
-            LOG(severity)
+            FAIR_LOG(severity)
 
 #endif // FAIR_LOGGER_H

test/ci/CMakeLists.txt

@@ -32,5 +32,10 @@ endfunction()
 container(OS fedora VERSION 32)
 container(OS fedora VERSION 33)
 container(OS fedora VERSION 34)
+container(OS fedora VERSION 35)
+container(OS fedora VERSION 36)
+container(OS fedora VERSION 37)
+container(OS fedora VERSION 38)
+container(OS fedora VERSION 39)
 
 add_custom_target(all-containers DEPENDS ${containers})

test/cycle.cxx

@@ -1,5 +1,5 @@
 /********************************************************************************
- * Copyright (C) 2014-2020 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH  *
+ * Copyright (C) 2015-2025 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH  *
  *                                                                              *
  *              This software is distributed under the terms of the             *
  *              GNU Lesser General Public Licence (LGPL) version 3,             *
@@ -38,7 +38,7 @@ int main()
         Logger::SetConsoleSeverity(Severity::fatal);
         cout << "initial severity >" << Logger::GetConsoleSeverity() << "<" << endl << endl;
 
-        array<Severity, 14> severitiesUp{{ Severity::nolog, Severity::trace, Severity::debug4, Severity::debug3, Severity::debug2, Severity::debug1, Severity::debug, Severity::info, Severity::state, Severity::warn, Severity::important, Severity::alarm, Severity::error, Severity::fatal }};
+        array<Severity, 16> severitiesUp{{ Severity::nolog, Severity::trace, Severity::debug4, Severity::debug3, Severity::debug2, Severity::debug1, Severity::debug, Severity::detail, Severity::info, Severity::state, Severity::warn, Severity::important, Severity::alarm, Severity::error, Severity::critical, Severity::fatal }};
 #ifdef FAIR_MIN_SEVERITY
         for (unsigned int i = static_cast<int>(Severity::FAIR_MIN_SEVERITY); i < severitiesUp.size(); ++i) {
 #else
@@ -57,7 +57,7 @@ int main()
         Logger::SetConsoleSeverity(Severity::fatal);
         cout << "initial severity >" << Logger::GetConsoleSeverity() << "<" << endl << endl;
 
-        array<Severity, 14> severitiesDown{{ Severity::error, Severity::alarm, Severity::important, Severity::warn, Severity::state, Severity::info, Severity::debug, Severity::debug1, Severity::debug2, Severity::debug3, Severity::debug4, Severity::trace, Severity::nolog, Severity::fatal }};
+        array<Severity, 16> severitiesDown{{ Severity::critical, Severity::error, Severity::alarm, Severity::important, Severity::warn, Severity::state, Severity::info, Severity::detail, Severity::debug, Severity::debug1, Severity::debug2, Severity::debug3, Severity::debug4, Severity::trace, Severity::nolog, Severity::fatal }};
 #ifdef FAIR_MIN_SEVERITY
         for (unsigned int i = 0; i < severitiesDown.size() - static_cast<int>(Severity::FAIR_MIN_SEVERITY) - 1; ++i) {
 #else

test/logger.cxx

@@ -24,12 +24,14 @@ void printEverySeverity()
     LOG(debug2)    << "debug2 message, counter: "    << i++;
     LOG(debug1)    << "debug1 message, counter: "    << i++;
     LOG(debug)     << "debug message, counter: "     << i++;
+    LOG(detail)    << "detail message, counter: "    << i++;
     LOG(info)      << "info message, counter: "      << i++;
     LOG(state)     << "state message, counter: "     << i++;
     LOG(warn)      << "warning message, counter: "   << i++;
     LOG(important) << "important message, counter: " << i++;
     LOG(alarm)     << "alarm message, counter: "     << i++;
     LOG(error)     << "error message, counter: "     << i++;
+    LOG(critical)  << "critical message, counter: "  << i++;
     LOG(fatal)     << "fatal message, counter: "     << i++;
 }
 

test/macros.cxx

@@ -51,6 +51,13 @@ int main()
         CheckOutput(ToStr(R"(^\[.*\]\[\d{2}:\d{2}:\d{2}\.\d{6}\]\[FATAL\]\[a:4:b\])", " c\n$"), []() {
             LOGD(Severity::fatal, "a", "4", "b") << "c";
         });
+
+        // Test dynamic severity macros
+        Logger::SetVerbosity(Verbosity::verylow);
+        Severity dynamicSeverity = Severity::fatal;
+
+        CheckOutput("^Hello dynamic world :-\\)!\n$", [&]() { LOGPD(dynamicSeverity, "Hello {} {}!", "dynamic world", ":-)"); });
+        CheckOutput("^Hello dynamic world :-\\)!\n$", [&]() { LOGFD(dynamicSeverity, "Hello %s %s!", "dynamic world", ":-)"); });
     } catch (runtime_error& rte) {
         cout << rte.what() << endl;
         return 1;

test/nolog.cxx

@@ -13,19 +13,21 @@ using namespace fair;
 
 void printEverySeverity()
 {
-    LOG(nolog)     << "nolog message, counter: ";
-    LOG(trace)     << "trace message, counter: ";
-    LOG(debug4)    << "debug4 message, counter: ";
-    LOG(debug3)    << "debug3 message, counter: ";
-    LOG(debug2)    << "debug2 message, counter: ";
-    LOG(debug1)    << "debug1 message, counter: ";
-    LOG(debug)     << "debug message, counter: ";
-    LOG(info)      << "info message, counter: ";
-    LOG(state)     << "state message, counter: ";
-    LOG(warn)      << "warning message, counter: ";
-    LOG(important) << "important message, counter: ";
-    LOG(alarm)     << "alarm message, counter: ";
-    LOG(error)     << "error message, counter: ";
+    LOG(nolog)     << "nolog message ";
+    LOG(trace)     << "trace message ";
+    LOG(debug4)    << "debug4 message ";
+    LOG(debug3)    << "debug3 message ";
+    LOG(debug2)    << "debug2 message ";
+    LOG(debug1)    << "debug1 message ";
+    LOG(debug)     << "debug message ";
+    LOG(detail)    << "detail message ";
+    LOG(info)      << "info message ";
+    LOG(state)     << "state message ";
+    LOG(warn)      << "warning message ";
+    LOG(important) << "important message ";
+    LOG(alarm)     << "alarm message ";
+    LOG(error)     << "error message ";
+    LOG(critical)  << "critical message ";
 }
 
 void silentlyPrintAllVerbositiesWithSeverity(Severity sev)

test/severity.cxx

@@ -27,12 +27,14 @@ uint32_t printEverySeverity(uint32_t i)
     LOG(debug2)    << "debug2 message, counter: "    << i++;
     LOG(debug1)    << "debug1 message, counter: "    << i++;
     LOG(debug)     << "debug message, counter: "     << i++;
+    LOG(detail)    << "detail message, counter: "    << i++;
     LOG(info)      << "info message, counter: "      << i++;
     LOG(state)     << "state message, counter: "     << i++;
     LOG(warn)      << "warning message, counter: "   << i++;
     LOG(important) << "important message, counter: " << i++;
     LOG(alarm)     << "alarm message, counter: "     << i++;
     LOG(error)     << "error message, counter: "     << i++;
+    LOG(critical)  << "critical message, counter: "  << i++;
     LOG(fatal)     << "fatal message, counter: "     << i++;
 
     return i;