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std::is_nothrow_move_constructible in C++ with Example

  • Last Updated : 12 Jun, 2020

The std::is_nothrow_move_constructible template of C++ STL is present in the <type_traits> header file. The std::is_nothrow_move_constructible template of C++ STL is used to check whether the given type T T is move constructibe or not and this is known for not to throw any exception. It return the boolean value true if T is a move constructible type, Otherwise it return false.

Header File:

#include<type_traits>

Template Class:

template <class T>
struct is_nothrow_move_constructible;

Syntax:

std::is_nothrow_move_constructible<T>::value

Parameters: The template std::is_nothrow_move_constructible accepts a single parameter T(Trait class) to check whether T is a move constructible type or not.



Return Value: This template returns a boolean variable as shown below:

  • True: If the type T is a move constructible type.
  • False: If the type T is not a move constructible type.

Below is the program to illustrates the std::is_nothrow_default_constructible template in C/C++:

Program:




// C++ program to illustrate
// std::is_nothrow_move_constructible
#include <bits/stdc++.h>
#include <type_traits>
using namespace std;
  
// Declare structures
struct B {
};
  
struct A {
    A& operator=(A&) = delete;
};
  
struct C {
    C(C&&) {}
};
  
struct D {
    D(D&&) = delete;
};
  
// Driver Code
int main()
{
    cout << boolalpha;
  
    // Check if int is no throw move
    // constructible or not
    cout << "int: "
         << is_nothrow_move_constructible<int>::value
         << endl;
  
    // Check if char is no throw move
    // constructible or not
    cout << "char: "
         << is_nothrow_move_constructible<char>::value
         << endl;
  
    // Check if floar is no throw move
    // constructible or not
    cout << "float: "
         << is_nothrow_move_constructible<float>::value
         << endl;
  
    // Check if struct A is no throw
    // move constructible or not
    cout << "struct A is nothrow move constructible? "
         << is_nothrow_move_constructible<A>::value
         << endl;
  
    // Check if struct B is no throw
    // move constructible or not
    cout << "struct B is nothrow move constructible? "
         << is_nothrow_move_constructible<B>::value
         << endl;
  
    // Check if struct C is no throw
    // move constructible or not
    cout << "struct C is nothrow move constructible? "
         << is_nothrow_move_constructible<C>::value
         << endl;
  
    // Check if struct D is no throw
    // move constructible or not
    cout << "struct D is nothrow move constructible? "
         << is_nothrow_move_constructible<D>::value
         << endl;
  
    return 0;
}
Output:
int: true
char: true
float: true
struct A is nothrow move constructible? true
struct B is nothrow move constructible? true
struct C is nothrow move constructible? false
struct D is nothrow move constructible? false

Reference: http://www.cplusplus.com/reference/type_traits/is_nothrow_move_constructible/

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