This applies even to functions and function overloads that are not part of C standard library. Including definitely provides :: malloc and may also provide std:: malloc. These headers are allowed to also declare the same names in the std namespace, and the corresponding c xxx headers are allowed to also declare the same names in the global namespace: including definitely provides std:: malloc and may also provide :: malloc. With the exception of complex.h, each xxx.h header included in the C++ standard library places in the global namespace each name that the corresponding c xxx header would have placed in the std namespace. Source files that are not intended to also be valid ISO C should not use any of the C headers. It is possible that C++ source files need to include one of these headers in order to be valid ISO C.

The intended use of headers of form xxx.h is for interoperability only. Std::thread class and supporting functions įor some of the C standard library headers of the form xxx.h, the C++ standard library both includes an identically-named header and another header of the form c xxx (all meaningful c xxx headers are listed above).

Conio library for c++