template <class T, class... Args>
struct is_constructible;

std::is_constructible::value

// C++ program to illustrate
// std::is_constructible example
#include <bits/stdc++.h>
#include <type_traits>
using namespace std;
 
// Declare structures
struct A {
};
 
struct T {
    T(int, int){};
};
 
// Driver Code
int main()
{
    cout << std::boolalpha;
 
    // Check if <int> is
    // constructible or not
    cout << "int: "
         << is_constructible<int>::value
         << endl;
 
    // Check if <int, float> is
    // constructible or not
    cout << "int(float): "
         << is_constructible<int, float>::value
         << endl;
 
    // Check if <int, float, float> is
    // constructible or not
    cout << "int(float, float): "
         << is_constructible<int, float, float>::value
         << endl;
 
    // Check if struct T is
    // constructible or not
    cout << "T: "
         << is_constructible<T>::value
         << endl;
 
    // Check if struct <T, int> is
    // constructible or not
    cout << "T(int): "
         << is_constructible<T, int>::value
         << endl;
 
    // Check if struct <T, int, int> is
    // constructible or not
    cout << "T(int, int): "
         << is_constructible<T, int, int>::value
         << endl;
    return 0;
}

int: true
int(float): true
int(float, float): false
T: false
T(int): false
T(int, int): true