16 Library introduction [library]

[support] through [exec] and [depr] describe the behavior of numerous functions defined by the C++ standard library.

Under some circumstances, however, certain of these function descriptions also apply to replacement functions defined in the program.

A C++ program may provide the definition for any of the following dynamic memory allocation function signatures declared in header <new> ([basic.stc.dynamic], [new.syn]):

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operator new(std::size_t) operator new(std::size_t, std::align_val_t) operator new(std::size_t, const std::nothrow_t&) operator new(std::size_t, std::align_val_t, const std::nothrow_t&)

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operator delete(void*) operator delete(void*, std::size_t) operator delete(void*, std::align_val_t) operator delete(void*, std::size_t, std::align_val_t) operator delete(void*, const std::nothrow_t&) operator delete(void*, std::align_val_t, const std::nothrow_t&)

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operator new[](std::size_t) operator new[](std::size_t, std::align_val_t) operator new[](std::size_t, const std::nothrow_t&) operator new[](std::size_t, std::align_val_t, const std::nothrow_t&)

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operator delete[](void*) operator delete[](void*, std::size_t) operator delete[](void*, std::align_val_t) operator delete[](void*, std::size_t, std::align_val_t) operator delete[](void*, const std::nothrow_t&) operator delete[](void*, std::align_val_t, const std::nothrow_t&)

A C++ program may provide the definition of the following function signature declared in header <debugging>: bool std::is_debugger_present() noexcept

The program's definitions are used instead of the default versions supplied by the implementation ([new.delete]).

Such replacement occurs prior to program startup ([basic.def.odr], [basic.start]).

The program's declarations shall not be specified as inline.

No diagnostic is required.