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iwyu - C/C++ source files #include analyzer based on clang
- Description:
"Include what you use" means this: for every symbol (type, function,
variable, or macro) that you use in foo.cc (or foo.cpp), either
foo.cc or foo.h should include a .h file that exports the declaration
of that symbol. (Similarly, for foo_test.cc, either foo_test.cc or
foo.h should do the including.) Obviously symbols defined in foo.cc
itself are excluded from this requirement.
This puts us in a state where every file includes the headers it needs
to declare the symbols that it uses. When every file includes what it
uses, then it is possible to edit any file and remove unused headers,
without fear of accidentally breaking the upwards dependencies of that
file. It also becomes easy to automatically track and update
dependencies in the source code.
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