Specifies that an object of the type can be copy-constructed in-place by a given allocator.
[edit] RequirementsGiven the following types, values and expressions:
Type DefinitionT an object type A an allocator type X a container type satisfying all following conditions:
X::value_type is the same as T.X::allocator_type is the same as std::allocator_traits<A>::rebind_alloc<T>.A p a pointer of type T* Expression Definition v an expression denoting an lvalue of type T / const T, or an rvalue of type const T expr std::allocator_traits<A>::construct(m, p, v)
T is CopyInsertable into X if all following conditions are satisfied:
T is MoveInsertable into X.If A is std::allocator<T>, then this will call placement new, as by ::new((void*)p) T(v)(until C++20)std::construct_at(p, v)(since C++20).
Although it is required that customized construct is used when constructing elements of std::basic_string until C++23, all implementations only used the default mechanism. The requirement is corrected by P1072R10 to match existing practice.
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR Applied to Behavior as published Correct behavior LWG 2177 C++11 evaluting expr did not have any postcondition added LWG 3957 C++11 v could denote an rvalue of typeT excluded
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