Make #pragma once standard in C++
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#pragma once is quite commonly supported in many compilers nowadays, however, despite this wide support, it is still not a C++ standard.
Making #pragma once a C++ standard would allow the C++ community to compile their code faster, write less code to do the same as #ifndef and it reduces the chances of a name clash. The reduction of the chances of a name clash, is due to the fact that the programmer is no longer required to handle the macro of the file, as the compiler does this.
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