3.4 KiB
[new.delete.placement]
17 Language support library [support]
17.6 Dynamic memory management [support.dynamic]
17.6.3 Storage allocation and deallocation [new.delete]
17.6.3.4 Non-allocating forms [new.delete.placement]
These functions are reserved; a C++ program may not define functions that displace the versions in the C++ standard library ([constraints]).
The provisions of [basic.stc.dynamic] do not apply to these reserved placement forms of operator new and operator delete.
constexpr void* operator new(std::size_t size, void* ptr) noexcept;
Returns: ptr.
Remarks: Intentionally performs no other action.
[Example 1:
This can be useful for constructing an object at a known address:void* place = operator new(sizeof(Something)); Something* p = new (place) Something();
â end example]
constexpr void* operator new[](std::size_t size, void* ptr) noexcept;
Returns: ptr.
Remarks: Intentionally performs no other action.
void operator delete(void* ptr, void*) noexcept;
Effects: Intentionally performs no action.
Remarks: Default function called when any part of the initialization in a placement new-expression that invokes the library's non-array placement operator new terminates by throwing an exception ([expr.new]).
void operator delete[](void* ptr, void*) noexcept;
Effects: Intentionally performs no action.
Remarks: Default function called when any part of the initialization in a placement new-expression that invokes the library's array placement operator new terminates by throwing an exception ([expr.new]).