class_template_decution.cpp

template < class T >
struct X
{
    X( T t ) { }
};

int main()
{
    X x1(0); // X<int>.
    X x2(0.0); // X<double>.
    X x3("hello"); // X<char const *>.
    
    X x4 = 0; // X<int>. Same as x1.
    X x5 = 0.0; // X<double>. Same as x2.
    X x6 = "hello"; // X<char const *>. Same as x3.
}