Specifies that an object of the type can be default-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*
If the expression std::allocator_traits<A>::construct(m, p) is well-formed, T is DefaultInsertable into X.
By default, this will value-initialize the object, as by ::new((void*)p) T()(until C++20)std::construct_at(p)(since C++20).
If value-initialization is undesirable, for example, if the object is of non-class type and zeroing out is not needed, it can be avoided by providing a custom Allocator::construct.
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 N3346 C++11 the requirements CopyInsertable and MoveInsertableRetroSearch is an open source project built by @garambo | Open a GitHub Issue
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