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Безымянные пространства имен внутри именованных.
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‎README.md

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- [Глобальные переменные в глобальном пространстве имён](syncfusion/cpp_succinctly/GlobalNamespaceSample/)
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- [Определение вложенных пространств имён](syncfusion/cpp_succinctly/NamespacesSample/)
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- [Безымянные пространства имен внутри именованных](ns/unnamed-namespace-within-named)
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# Переменные

‎ns/unnamed-namespace-within-named/.gitignore

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# ---------------------------------------------------------------------------
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# https://github.com/github/gitignore/blob/master/C++.gitignore
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# Prerequisites
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*.d
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# Compiled Object files
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*.slo
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*.lo
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*.o
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*.obj
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# Precompiled Headers
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*.gch
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*.pch
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# Compiled Dynamic libraries
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*.so
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*.dylib
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*.dll
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# Fortran module files
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*.mod
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*.smod
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# Compiled Static libraries
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*.lai
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*.la
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*.a
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*.lib
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# Executables
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*.exe
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*.out
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*.app
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# ---------------------------------------------------------------------------
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# https://github.com/github/gitignore/blob/master/Global/JetBrains.gitignore
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# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
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# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
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# User-specific stuff
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.idea/**/workspace.xml
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.idea/**/tasks.xml
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.idea/**/usage.statistics.xml
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.idea/**/dictionaries
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.idea/**/shelf
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# AWS User-specific
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.idea/**/aws.xml
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# Generated files
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.idea/**/contentModel.xml
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# Sensitive or high-churn files
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.idea/**/dataSources/
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.idea/**/dataSources.ids
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.idea/**/dataSources.local.xml
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.idea/**/sqlDataSources.xml
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.idea/**/dynamic.xml
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.idea/**/uiDesigner.xml
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.idea/**/dbnavigator.xml
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# Gradle
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.idea/**/gradle.xml
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.idea/**/libraries
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# Gradle and Maven with auto-import
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# When using Gradle or Maven with auto-import, you should exclude module files,
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# since they will be recreated, and may cause churn. Uncomment if using
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# auto-import.
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# .idea/artifacts
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# .idea/compiler.xml
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# .idea/jarRepositories.xml
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# .idea/modules.xml
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# .idea/*.iml
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# .idea/modules
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# *.iml
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# *.ipr
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# CMake
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cmake-build-*/
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# Mongo Explorer plugin
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.idea/**/mongoSettings.xml
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# File-based project format
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*.iws
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# IntelliJ
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out/
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# mpeltonen/sbt-idea plugin
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.idea_modules/
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# JIRA plugin
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atlassian-ide-plugin.xml
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# Cursive Clojure plugin
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.idea/replstate.xml
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# SonarLint plugin
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.idea/sonarlint/
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# Crashlytics plugin (for Android Studio and IntelliJ)
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com_crashlytics_export_strings.xml
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crashlytics.properties
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crashlytics-build.properties
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fabric.properties
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# Editor-based Rest Client
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.idea/httpRequests
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# Android studio 3.1+ serialized cache file
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.idea/caches/build_file_checksums.ser
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# ---------------------------------------------------------------------------
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# https://github.com/github/gitignore/blob/master/Global/macOS.gitignore
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# General
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.DS_Store
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.AppleDouble
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.LSOverride
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# Icon must end with two \r
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Icon
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# Thumbnails
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._*
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# Files that might appear in the root of a volume
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.DocumentRevisions-V100
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.fseventsd
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.Spotlight-V100
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.TemporaryItems
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.Trashes
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.VolumeIcon.icns
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.com.apple.timemachine.donotpresent
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# Directories potentially created on remote AFP share
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.AppleDB
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.AppleDesktop
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Network Trash Folder
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Temporary Items
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.apdisk
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# ---------------------------------------------------------------------------
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# https://github.com/github/gitignore/blob/master/CMake.gitignore
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CMakeLists.txt.user
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CMakeCache.txt
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CMakeFiles
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CMakeScripts
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Testing
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Makefile
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cmake_install.cmake
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install_manifest.txt
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compile_commands.json
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CTestTestfile.cmake
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_deps
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# ---------------------------------------------------------------------------

‎ns/unnamed-namespace-within-named/.idea/.gitignore

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‎ns/unnamed-namespace-within-named/.idea/.name

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‎ns/unnamed-namespace-within-named/.idea/misc.xml

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‎ns/unnamed-namespace-within-named/.idea/modules.xml

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‎ns/unnamed-namespace-within-named/.idea/unnamed-namespace-within-named.iml

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‎ns/unnamed-namespace-within-named/.idea/vcs.xml

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‎ns/unnamed-namespace-within-named/A.cc

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//
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// Created by Abbas Gussenov on 2/23/22.
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//
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#include "A.h"
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#include <iostream>
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// void Foo() { std::cout << "Foo() in A.cc" << std::endl; }
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// duplicate symbol 'Foo()' in:
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// CMakeFiles/UnnamedNamespaceWithinNamedNamespace.dir/A.cc.o
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// CMakeFiles/UnnamedNamespaceWithinNamedNamespace.dir/B.cc.o
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// ld: 1 duplicate symbol for architecture x86_64
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// Объявление, чтобы можно было вызывать:
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namespace {
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namespace {
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namespace {
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void Quuux();
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}
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}
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}
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void Bat()
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{
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// Bar();
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// Undefined symbols for architecture x86_64:
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// "Bar()", referenced from:
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// Bat() in A.cc.o
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// Baz() in B.cc.o
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// ld: symbol(s) not found for architecture x86_64
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// Qux(); // Use of undeclared identifier 'Qux'
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Quuux();
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}
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namespace
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{ // An unnamed namespace hide names inside it from different translation units.
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void Bar() { std::cout << "Bar() in A.cc" << std::endl; }
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void Qux() { std::cout << "Qux() in B.cc" << std::endl; }
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namespace
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{
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void Quux() { std::cout << "Quux() in A.cc" << std::endl; }
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namespace
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{
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void Quuux() { std::cout << "Quuux() in A.cc" << std::endl; }
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}
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}
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}
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void Temp()
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{
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// Bar(); // Call to 'Bar' is ambiguous
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Quuux();
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}
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void Sub()
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{
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// qwe::Asd();
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// Undefined symbols for architecture x86_64:
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// "qwe::Asd()", referenced from:
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// Sub() in A.cc.o
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// ld: symbol(s) not found for architecture x86_64
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//
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// Объявлено как qwe::Asd(), а определено как qwe::(anonymous namespace)::Asd(),
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// поэтому не находит.
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qwe::Zxc();
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// Объявление qwe::(anonymous namespace)::Zxc() и определение совпадают поэтому ОК.
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}
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namespace qwe
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{
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// void DoTheStuff() { std::cout << "DoTheStuff() in A.cc" << std::endl; }
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// duplicate symbol 'qwe::DoTheStuff()' in:
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// CMakeFiles/UnnamedNamespaceWithinNamedNamespace.dir/A.cc.o
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// CMakeFiles/UnnamedNamespaceWithinNamedNamespace.dir/B.cc.o
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// ld: 1 duplicate symbol for architecture x86_64
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namespace
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{ // An unnamed namespace hide names inside it from different translation units.
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void Asd() { std::cout << "Asd() in A.cc" << std::endl; }
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void Zxc() { std::cout << "Zxc() in A.cc" << std::endl; }
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void Aaa() { std::cout << "Aaa() in A.cc" << std::endl; }
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}
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}

‎ns/unnamed-namespace-within-named/A.h

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//
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// Created by Abbas Gussenov on 2/23/22.
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//
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#ifndef UNNAMED_NAMESPACE_WITHIN_NAMED_A_H
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#define UNNAMED_NAMESPACE_WITHIN_NAMED_A_H
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void Bat();
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void Bar();
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namespace qwe
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{
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void Asd();
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namespace
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{
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void Zxc();
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void Aaa(); // function 'qwe::(anonymous namespace)::Aaa' has internal linkage
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}
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}
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void Sub();
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#endif //UNNAMED_NAMESPACE_WITHIN_NAMED_A_H

‎ns/unnamed-namespace-within-named/B.cc

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//
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// Created by Abbas Gussenov on 2/23/22.
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//
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#include "B.h"
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#include <iostream>
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// void Foo() { std::cout << "Foo() in B.cc" << std::endl; }
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// duplicate symbol 'Foo()' in:
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// CMakeFiles/UnnamedNamespaceWithinNamedNamespace.dir/A.cc.o
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// CMakeFiles/UnnamedNamespaceWithinNamedNamespace.dir/B.cc.o
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// ld: 1 duplicate symbol for architecture x86_64
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void Baz()
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{
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// Bar();
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// Undefined symbols for architecture x86_64:
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// "Bar()", referenced from:
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// Bat() in A.cc.o
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// Baz() in B.cc.o
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// ld: symbol(s) not found for architecture x86_64
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}
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namespace
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{ // An unnamed namespace hide names inside it from different translation units.
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void Bar() { std::cout << "Bar() in B.cc" << std::endl; }
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void Qux() { std::cout << "Qux() in B.cc" << std::endl; }
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namespace
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{
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void Quux() { std::cout << "Quux() in B.cc" << std::endl; }
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namespace
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{
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void Quuux() { std::cout << "Quuux() in B.cc" << std::endl; }
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}
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}
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}
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void Test()
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{
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// Bar(); // Call to 'Bar' is ambiguous
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Quuux();
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}
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namespace qwe
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{
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// void DoTheStuff() { std::cout << "DoTheStuff() in B.cc" << std::endl; }
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// duplicate symbol 'qwe::DoTheStuff()' in:
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// CMakeFiles/UnnamedNamespaceWithinNamedNamespace.dir/A.cc.o
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// CMakeFiles/UnnamedNamespaceWithinNamedNamespace.dir/B.cc.o
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// ld: 1 duplicate symbol for architecture x86_64
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namespace
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{ // An unnamed namespace hide names inside it from different translation units.
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void Asd() { std::cout << "Asd() in B.cc" << std::endl; }
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void Zxc() { std::cout << "Zxc() in B.cc" << std::endl; }
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}
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}

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