6 Basics [basic]

6.7 Memory and objects [basic.memobj]

6.7.5 Storage duration [basic.stc]

6.7.5.5 Dynamic storage duration [basic.stc.dynamic]

6.7.5.5.3 Deallocation functions [basic.stc.dynamic.deallocation]

1
#
A deallocation function that is not a class member function shall belong to the global scope and not have a name with internal linkage.
2
#
A deallocation function is a destroying operator delete if it has at least two parameters and its second parameter is of type std​::​destroying_delete_t.
A destroying operator delete shall be a class member function named operator delete.
[Note 1: 
Array deletion cannot use a destroying operator delete.
— end note]
3
#
Each deallocation function shall return void.
If the function is a destroying operator delete declared in class type C, the type of its first parameter shall be C*; otherwise, the type of its first parameter shall be void*.
A deallocation function may have more than one parameter.
A usual deallocation function is a deallocation function whose parameters after the first are
  • (3.1)
    optionally, a parameter of type std​::​destroying_delete_t, then
  • (3.2)
    optionally, a parameter of type std​::​size_t,25 then
  • (3.3)
    optionally, a parameter of type std​::​align_val_t.
A destroying operator delete shall be a usual deallocation function.
A deallocation function may be an instance of a function template.
Neither the first parameter nor the return type shall depend on a template parameter.
A deallocation function template shall have two or more function parameters.
A template instance is never a usual deallocation function, regardless of its signature.
4
#
If a deallocation function terminates by throwing an exception, the behavior is undefined.
The value of the first argument supplied to a deallocation function may be a null pointer value; if so, and if the deallocation function is one supplied in the standard library, the call has no effect.
5
#
If the argument given to a deallocation function in the standard library is a pointer that is not the null pointer value ([basic.compound]), the deallocation function shall deallocate the storage referenced by the pointer, ending the duration of the region of storage.
25)25)
The global operator delete(void*, std​::​size_t) precludes use of an allocation function void operator new(std​::​size_t, std​::​size_t) as a placement allocation function ([diff.cpp11.basic]).