The library provides default definitions for the global allocation and
deallocation functions. Some global allocation and deallocation
functions are replaceable\iref{new.delete};
these are attached to the global module\iref{module.unit}.
A \Cpp{} program shall
provide at most one definition of a replaceable allocation or
deallocation function. Any such function definition replaces the default
version provided in the library\iref{replacement.functions}. The
following allocation and deallocation functions\iref{support.dynamic}
are implicitly declared in global scope in each translation unit of a
program.

[[nodiscard]] void* operator new(std::size_t);
[[nodiscard]] void* operator new(std::size_t, std::align_val_t);

void operator delete(void*) noexcept;
void operator delete(void*, std::size_t) noexcept;
void operator delete(void*, std::align_val_t) noexcept;
void operator delete(void*, std::size_t, std::align_val_t) noexcept;

[[nodiscard]] void* operator new[](std::size_t);
[[nodiscard]] void* operator new[](std::size_t, std::align_val_t);

void operator delete[](void*) noexcept;
void operator delete[](void*, std::size_t) noexcept;
void operator delete[](void*, std::align_val_t) noexcept;
void operator delete[](void*, std::size_t, std::align_val_t) noexcept;

The
following replaceable allocation and deallocation functions\iref{support.dynamic}
are implicitly declared in global scope in each translation unit of a
program.