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Showing content from https://en.cppreference.com/w/cpp/language/../memory/shared_ptr/../new/../allocator/construct.html below:

std::allocator<T>::construct - cppreference.com

void construct( pointer p, const_reference val );

(1) (until C++11)

template< class U, class... Args > void construct( U* p, Args&&... args );

(2) (since C++11)
(deprecated in C++17)
(removed in C++20)

Constructs an object of type T in allocated uninitialized storage pointed to by p, using global placement-new.

1) Calls ::new((void*)p) T(val).

[edit] Parameters p - pointer to allocated uninitialized storage val - the value to use as the copy constructor argument args... - the constructor arguments to use [edit] Return value

(none)

[edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior LWG 402 C++98 if T::operator new exists, the program might be ill-formed uses global replacement-new instead [edit] See also

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