void* operator new(std::size_t size);
Replaceable: a C++ program may define a function with this function signature that displaces the default version defined by the C++ standard library.
Required behavior: Return a non-null pointer to suitably aligned storage ([basic.stc.dynamic]), or else throw a bad_alloc exception. This requirement is binding on a replacement version of this function.
Default behavior:
Executes a loop: Within the loop, the function first attempts to allocate the requested storage. Whether the attempt involves a call to the Standard C library function malloc is unspecified.
Returns a pointer to the allocated storage if the attempt is successful. Otherwise, if the current new_handler ([get.new.handler]) is a null pointer value, throws bad_alloc.
Otherwise, the function calls the current new_handler function ([new.handler]). If the called function returns, the loop repeats.
The loop terminates when an attempt to allocate the requested storage is successful or when a called new_handler function does not return.
void* operator new(std::size_t size, const std::nothrow_t&) noexcept;
Effects: Same as above, except that it is called by a placement version of a new-expression when a C++ program prefers a null pointer result as an error indication, instead of a bad_alloc exception.
Replaceable: a C++ program may define a function with this function signature that displaces the default version defined by the C++ standard library.
Required behavior: Return a non-null pointer to suitably aligned storage ([basic.stc.dynamic]), or else return a null pointer. This nothrow version of operator new returns a pointer obtained as if acquired from the (possibly replaced) ordinary version. This requirement is binding on a replacement version of this function.
Default behavior: Calls operator new(size). If the call returns normally, returns the result of that call. Otherwise, returns a null pointer.
[ Example:
T* p1 = new T; T* p2 = new(nothrow) T;
— end example ]
void operator delete(void* ptr) noexcept; void operator delete(void* ptr, std::size_t size) noexcept;
Replaceable: a C++ program may define a function with signature void operator delete(void* ptr) noexcept that displaces the default version defined by the C++ standard library. If this function (without size parameter) is defined, the program should also define void operator delete(void* ptr, std::size_t size) noexcept. If this function with size parameter is defined, the program shall also define the version without the size parameter. [ Note: The default behavior below may change in the future, which will require replacing both deallocation functions when replacing the allocation function. — end note ]
Requires: ptr shall be a null pointer or its value shall be a value returned by an earlier call to the (possibly replaced) operator new(std::size_t) or operator new(std::size_t,const std::nothrow_t&) which has not been invalidated by an intervening call to operator delete(void*).
Requires: If present, the std::size_t size argument shall equal the size argument passed to the allocation function that returned ptr.
Required behavior: Calls to operator delete(void* ptr, std::size_t size) may be changed to calls to operator delete(void* ptr) without affecting memory allocation. [ Note: A conforming implementation is for operator delete(void* ptr, std::size_t size) to simply call operator delete(ptr). — end note ]
Default behavior: the function operator delete(void* ptr, std::size_t size) calls operator delete(ptr). [ Note: See the note in the above Replaceable paragraph. — end note ]
Default behavior: If ptr is null, does nothing. Otherwise, reclaims the storage allocated by the earlier call to operator new.
Remarks: It is unspecified under what conditions part or all of such reclaimed storage will be allocated by subsequent calls to operator new or any of calloc, malloc, or realloc, declared in <cstdlib>.
void operator delete(void* ptr, const std::nothrow_t&) noexcept; void operator delete(void* ptr, std::size_t size, const std::nothrow_t&) noexcept;
Replaceable: a C++ program may define a function with signature void operator delete(void* ptr, const std::nothrow_t&) noexcept that displaces the default version defined by the C++ standard library. If this function (without size parameter) is defined, the program should also define void operator delete(void* ptr, std::size_t size, const std::nothrow_t&) noexcept. If this function with size parameter is defined, the program shall also define the version without the size parameter. [ Note: The default behavior below may change in the future, which will require replacing both deallocation functions when replacing the allocation function. — end note ]
Requires: If present, the std::size_t size argument must equal the size argument passed to the allocation function that returned ptr.
Required behavior: Calls to operator delete(void* ptr, std::size_t size, const std::nothrow_t&) may be changed to calls to operator delete(void* ptr, const std::nothrow_t&) without affecting memory allocation. [ Note: A conforming implementation is for operator delete(void* ptr, std::size_t size, const std::nothrow_t&) to simply call operator delete(void* ptr, const std::nothrow_t&). — end note ]
Default behavior: operator delete(void* ptr, std::size_t size, const std::nothrow_t&) calls operator delete(ptr, std::nothrow), and operator delete(void* ptr, const std::nothrow_t&) calls operator delete(ptr).
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