allocator::construct
Constructs a specific type of object at a specified address that is initialized with a specified value.
void construct(
pointer _Ptr,
const Type& _Val
);
void construct(
pointer _Ptr,
Type&& _Val
);
template<class _Other>
void construct(
pointer _Ptr,
_Other&&... _Val
);
Parameters
_Ptr
A pointer to the location where the object is to be constructed._Val
The value with which the object being constructed is to be initialized.
Remarks
The first member function is equivalent to new ( (void *) _Ptr ) Type ( _Val ).
Example
// allocator_construct.cpp
// compile with: /EHsc
#include <memory>
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
int main( )
{
vector <int> v1;
vector <int>::iterator v1Iter;
vector <int>:: allocator_type v1Alloc;
int i;
for ( i = 1 ; i <= 7 ; i++ )
{
v1.push_back( 3 * i );
}
cout << "The original vector v1 is:\n ( " ;
for ( v1Iter = v1.begin( ) ; v1Iter != v1.end( ) ; v1Iter++ )
cout << *v1Iter << " ";
cout << ")." << endl;
allocator<int>::pointer v1PtrA;
int kA = 6, kB = 7;
v1PtrA = v1Alloc.address( *find( v1.begin( ), v1.end( ), kA ) );
v1Alloc.destroy ( v1PtrA );
v1Alloc.construct ( v1PtrA , kB );
cout << "The modified vector v1 is:\n ( " ;
for ( v1Iter = v1.begin( ) ; v1Iter != v1.end( ) ; v1Iter++ )
cout << *v1Iter << " ";
cout << ")." << endl;
}
The original vector v1 is: ( 3 6 9 12 15 18 21 ). The modified vector v1 is: ( 3 7 9 12 15 18 21 ).
Requirements
Header: <memory>
Namespace: std