Include What You Use

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Include What You Use (no more, no less)

References:

• https://google.github.io/styleguide/cppguide.html#Include_What_You_Use
• https://rawgit.com/AliceO2Group/CodingGuidelines/master/coding_guidelines.html#Header_Files
• https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#sf10-avoid-dependencies-on-implicitly-included-names
• https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Rs-contained
• https://llvm.org/docs/CodingStandards.html#include-as-little-as-possible
• https://github.com/include-what-you-use/include-what-you-use/blob/master/docs/WhyIWYU.md

Tools

• https://clang.llvm.org/extra/clang-tidy/checks/misc/include-cleaner.html
• https://clang.llvm.org/extra/clang-tidy/checks/llvm/include-order.html
• https://clangd.llvm.org/design/include-cleaner