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]

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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.
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constexpr void* operator new(std::size_t size, void* ptr) noexcept;
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Returns: ptr.
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Remarks: Intentionally performs no other action.
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[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();
— end example]
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constexpr void* operator new[](std::size_t size, void* ptr) noexcept;
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Returns: ptr.
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Remarks: Intentionally performs no other action.
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constexpr void operator delete(void* ptr, void*) noexcept;
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Effects: Intentionally performs no action.
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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]).
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constexpr void operator delete[](void* ptr, void*) noexcept;
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Effects: Intentionally performs no action.
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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]).