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I wonder where on my file system I find the headers of the C++ Standard library. In particular I am looking for the definition of the vector template. I searched in /usr/include/ and various subdirectories. I also tried 'locate vector.h' which brought up many implementations of vectors, but not the standard one. What am I missing? (The distribution is Gentoo)
Background: I'm profiling a library that iterates over vector's most of the time and gprof shows that most of the time is spent in
std::vector<int, std::allocator<int> >::_M_insert_aux( __gnu_cxx::__normal_iterator<int*, std::vector< int, std::allocator<int> > >, int const&) Probably this is what happens internally on a std::vector::push_back, but I'm not sure.
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Most standard headers are stored in /usr/include . It looks like stdbool. h is stored somewhere else, and depends on which compiler you are using. For example, g++ stores it in /usr/include/c++/4.7.
C Standard library functions or simply C Library functions are inbuilt functions in C programming. The prototype and data definitions of these functions are present in their respective header files. To use these functions we need to include the header file in our program.
In C language, header files contain the set of predefined standard library functions. The “#include” preprocessing directive is used to include the header files with “. h” extension in the program.
The ANSI C standard library consists of 24 C header files which can be included into a programmer's project with a single directive. Each header file contains one or more function declarations, data type definitions and macros.
GCC typically has the standard C++ headers installed in /usr/include/c++/<version>/. You can run gcc -v to find out which version you have installed.
At least in my version, there is no vector.h; the public header is just vector (with no extension), and most of the implementation is in bits/stl_vector.h.
That's the case on my Ubuntu distribution; your distribution may differ.
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Running g++ -v -v -v outputs lots of things, including all the include directories searched. vector is in one of those.
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