#include <type_traits>

template <class T>
struct is_move_assignable;

std::is_move_assignable<T>::value

// C++ program to illustrate
// std::is_move_assignable
#include <bits/stdc++.h>
#include <type_traits>
using namespace std;
  
// Declare structures
struct A {
};
  
struct B {
    B& operator=(B&) = delete;
};
  
struct C {
    ~C() = delete;
};
  
// Driver Code
int main()
{
  
    cout << boolalpha;
  
    // Check if int is move
    // assignable or not
    cout << "int: "
         << is_move_assignable<int>::value
         << endl;
  
    // Check if struct A is move
    // assignable or not
    cout << "struct A: "
         << is_move_assignable<A>::value
         << endl;
  
    // Check if struct B is move
    // assignable or not
    cout << "struct B: "
         << is_move_assignable<B>::value
         << endl;
  
    // Check if struct C is move
    // assignable or not
    cout << "struct C: "
         << is_move_assignable<C>::value
         << endl;
  
    // Declare an map
    unordered_multimap<int, string> m;
    m.insert({ 1, "GfG" });
  
    // Check if map m is move
    // assignable or not?
    cout << "Map m: "
         << is_move_assignable<decltype(*m.begin())>::value;
  
    return 0;
}

int: true
struct A: true
struct B: false
struct C: true
Map m: true