16 Library introduction [library]

16.4 Library-wide requirements [requirements]

16.4.5 Constraints on programs [constraints] Replacement functions [replacement.functions]

[support] through [thread] 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]): 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&) 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&) 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&) 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&)
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.