[basic.stc.dynamic.general]

Objects can be created dynamically during program execution, using new-expressions ([expr.new]), and destroyed using delete-expressions ([expr.delete]).

A C++ implementation provides access to, and management of, dynamic storage via the global allocation functions operator new and operator new[] and the global deallocation functions operator delete and operator delete[].

[Note 1:

The non-allocating forms described in [new.delete.placement] do not perform allocation or deallocation.

— end note]

The library provides default definitions for the global allocation and deallocation functions.

Some global allocation and deallocation functions are replaceable ([new.delete]); these are attached to the global module ([module.unit]).

A C++ 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 ([replacement.functions]).

The following allocation and deallocation functions ([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;

These implicit declarations introduce only the function names operator new, operator new[], operator delete, and operator delete[].

[Note 2:

The implicit declarations do not introduce the names std, std::size_t, std::align_val_t, or any other names that the library uses to declare these names.

Thus, a new-expression, delete-expression, or function call that refers to one of these functions without importing or including the header <new> or importing a C++ library module ([std.modules]) is well-formed.

However, referring to std or std::size_t or std::align_val_t is ill-formed unless a standard library declaration ([cstddef.syn], [new.syn], [std.modules]) of that name precedes ([basic.lookup.general]) the use of that name.

— end note]

Allocation and/or deallocation functions may also be declared and defined for any class ([class.free]).

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]

6.7.5.5.1 General [basic.stc.dynamic.general]