std::allocator<T>::construct
From cppreference.com
C++
Memory management library
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std::allocator
Member functions | ||||
(until C++20)
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(C++23)
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(until C++20)
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allocator::construct
(until C++20)
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(until C++20)
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Non-member functions | ||||
(until C++20)
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Defined in header <memory>
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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)
2) Calls
::
new
(
(
void
*
)p) U(
std::forward
<Args>
(args)...)
Parameters
p | - | pointer to allocated uninitialized storage |
val | - | the value to use as the copy constructor argument |
args... | - | the constructor arguments to use |
Return value
(none)
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 |
See also
[static]
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constructs an object in the allocated storage (function template) |
(C++20)
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creates an object at a given address (function template) |
allocation functions (function) |