Dynamic memory management
Uninitialized storage
Garbage collection support
C Library
Low level memory management
Defined in header <memory>
template< class T, class... Args >
static void construct( Alloc& a, T* p, Args&&... args );
(since C++11)

If possible, constructs an object of type T in allocated uninitialized storage pointed to by p, by calling

a.construct(p, std::forward<Args>(args)...)

If the above is not possible (e.g. a does not have the member function construct(),), then calls placement-new as

::new (static_cast<void*>(p)) T(std::forward<Args>(args)...)


a - allocator to use for construction
args... - the constructor arguments to pass to a.construct() or to placement-new

Return value



This function is used by the standard library containers when inserting, copying, or moving elements.

Because this function provides the automatic fall back to placement new, the member function construct() is an optional Allocator requirement since C++11.

See also

allocation functions
(deprecated in C++17)(removed in C++20)
constructs an object in allocated storage
(public member function of std::allocator<T>)