operator== (<memory>)
Tests for equality between objects.
template<class Type, class Other>
bool operator==(
const allocator<Type>& _Left,
const allocator<Other>& _Right
) throw();
template<class Ty1, class Del1, class Ty2, class Del2>
bool operator==(
const unique_ptr<Ty1, Del1>& _Left,
const unique_ptr<Ty2, Del2>& _Right
);
template<class Ty1, class Ty2>
bool operator==(
const shared_ptr<Ty1>& _Left;,
const shared_ptr<Ty2>& _Right
);
Parameters
_Left
One of the objects to be tested for equality._Right
One of the objects to be tested for equality.Ty1
The type controlled by the left shared pointer.Ty2
The type controlled by the right shared pointer.
Return Value
true if the objects are equal, false if objects are not equal.
Remarks
The first template operator returns true. (All default allocators are equal.)
The second and third template operators return _Left.get() == _Right.get().
Example
// memory_op_eq.cpp
// compile with: /EHsc
#include <memory>
#include <iostream>
#include <vector>
using namespace std;
int main( )
{
allocator<char> Alloc;
vector <int>:: allocator_type v1Alloc;
allocator<char> cAlloc(Alloc);
allocator<int> cv1Alloc(v1Alloc);
if ( cv1Alloc == v1Alloc )
cout << "The allocator objects cv1Alloc & v1Alloc are equal."
<< endl;
else
cout << "The allocator objects cv1Alloc & v1Alloc are not equal."
<< endl;
if ( cAlloc == Alloc )
cout << "The allocator objects cAlloc & Alloc are equal."
<< endl;
else
cout << "The allocator objects cAlloc & Alloc are not equal."
<< endl;
}
The allocator objects cv1Alloc & v1Alloc are equal. The allocator objects cAlloc & Alloc are equal.
// std_tr1__memory__operator_eq.cpp
// compile with: /EHsc
#include <memory>
#include <iostream>
int main()
{
std::shared_ptr<int> sp0(new int(0));
std::shared_ptr<int> sp1(new int(0));
std::cout << "sp0 == sp0 == " << std::boolalpha
<< (sp0 == sp0) << std::endl;
std::cout << "sp0 == sp1 == " << std::boolalpha
<< (sp0 == sp1) << std::endl;
return (0);
}
sp0 == sp0 == true sp0 == sp1 == false
Requirements
Header: <memory>
Namespace: std