std::is_nothrow_copy_assignable in C++ with Examples
Last Updated :
12 Jun, 2020
The std::is_nothrow_copy_assignable template of C++ STL is present in the <type_traits> header file. The std::is_nothrow_copy_assignable template of C++ STL is used to check whether T is copy assignable type or not and this is known for not to throw any exception. It returns the boolean value either true or false.
Header File:
#include<type_traits>
Template Class:
template< class T >
struct is_nothrow_copy_assignable;
Syntax:
std::is_nothrow_copy_assignable< datatype >::value << '\n'
Parameters: The template std::is_nothrow_copy_assignable accepts a single parameter T (Trait class) to check whether T is is_nothrow_copy_assignable type or not.
Return Value:
- True: If a given data type T is a nothrow copy assignable.
- False: If a given data type T is not a nothrow copy assignable.
Below is the program to demonstrate std::is_nothrow_copy_assignable in C++:
Program:
#include <bits/stdc++.h>
#include <type_traits>
using namespace std;
struct X {
};
struct Y {
Y& operator=( const Y&)
{
return * this ;
}
};
class A {
};
class B {
B() {}
};
class C : B {
};
class D {
virtual void fn() {}
};
int main()
{
cout << std::boolalpha;
cout << "int: "
<< is_nothrow_copy_assignable< int >::value
<< endl;
cout << "struct X: "
<< is_nothrow_copy_assignable<X>::value
<< endl;
cout << "struct Y: "
<< is_nothrow_copy_assignable<Y>::value
<< endl;
cout << "int[2]: "
<< is_nothrow_copy_assignable< int [2]>::value
<< endl;
cout << "class A: "
<< is_nothrow_copy_assignable<A>::value
<< endl;
cout << "class B: "
<< is_nothrow_copy_assignable<B>::value
<< endl;
cout << "class C: "
<< is_nothrow_copy_assignable<C>::value
<< endl;
cout << "class D: "
<< is_nothrow_copy_assignable<D>::value
<< endl;
return 0;
}
|
Output:
int: true
struct X: true
struct Y: false
int[2]: false
class A: true
class B: true
class C: true
class D: true
Reference: http://www.cplusplus.com/reference/type_traits/is_nothrow_copy_assignable/
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