What is the correct way to utilize __has_include?

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_hasinclude is a preprocessor macro that allows you to check whether a header file is available before including it in your code. It is useful when writing cross-platform code that might require different header files on different systems.

The correct way to utilize _hasinclude is to use it in a conditional statement, like this:

#if __has_include(<header_file>)
    // header file is available
    #include <header_file>
#else
    // header file is not available
#endif

Replace <header_file> with the name of the header file you want to check for. The code inside the #if block will only be compiled if the header file is available, otherwise the code inside the #else block will be compiled instead.