C++

参考

<memory>

allocator

public member function
<memory>

std::allocator::construct

void construct ( pointer p, const_reference val );
template <class U, class... Args>  void construct (U* p, Args&&... args);
Construct an object
Constructs an element object on the location pointed to by p.

Note that this does not allocate space for the element. It should already be available at p (see member allocate to allocate space).

The function constructs an object of member typevalue_type(an alias of allocator's template parameter) using its copy constructor to initialize its value to a copy of val, as if the following code was used
new ((void*)p) value_type (val);
The function constructs an object of type U in-place by forwarding its arguments to the appropriate constructor, as if the following code was used
::new ((void*)p) U (forward<Args>(args)...);

参数

p
Pointer to a location with enough storage space to contain an element of typevalue_type.
指针is a member type (defined as an alias ofT*instd::allocator<T>).
val
Value to initialize the constructed element to.
const_referenceis a member type (defined as an alias ofT&instd::allocator<T>).
p
Pointer to a location with enough storage space to contain an element of type U.
args
Arguments forwarded to the constructor.
Argsis a list of zero or more types.

返回值

无

另见

allocator::allocate
Allocate block of storage (public member function)
allocator::destroy
Destroy an object (public member function)