std::is_nothrow_default_constructible in C++ with Examples
Last Updated :
12 Jun, 2020
The std::is_nothrow_default_constructible template of C++ STL is present in the <type_traits> header file. The std::is_nothrow_default_constructible template of C++ STL is used to check whether the given type T is default constructible type or not and this is known for not to throw any exception. It return the boolean value true if T is default constructible type, Otherwise return false.
Header File:
#include<type_traits>
Template Class:
template <class T>
struct is_nothrow_default_constructible;
Syntax:
std::is_nothrow_default_constructible::value
Parameters: The template std::is_nothrow_default_constructible accepts a single parameter T(Trait class) to check whether T is default constructible type or not.
Return Value: This template returns a boolean variable as shown below:
- True: If the type T is a is_nothrow_default_constructible.
- False: If the type T is not a is_nothrow_default_constructible.
Below is the program to illustrates the std::is_nothrow_default_constructible template in C/C++:
Program 1:
#include <bits/stdc++.h>
#include <type_traits>
using namespace std;
struct X {
X( int , float ){};
};
struct Y {
Y( const Y&) {}
};
struct Z {
int n;
Z() = default ;
};
int main()
{
cout << boolalpha;
cout << "int: "
<< is_nothrow_default_constructible< int >::value
<< endl;
cout << "struct X: "
<< is_nothrow_default_constructible<X>::value
<< endl;
cout << "struct Y: "
<< is_nothrow_default_constructible<Y>::value
<< endl;
cout << "struct Z: "
<< is_nothrow_default_constructible<Z>::value
<< endl;
cout << "constructor X(int, float): "
<< is_nothrow_default_constructible<X( int , float )>::value
<< endl;
return 0;
}
|
Output:
int: true
struct X: false
struct Y: false
struct Z: true
constructor X(int, float): false
Reference: http://www.cplusplus.com/reference/type_traits/is_nothrow_default_constructible/
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