C++17 initializer_list

发表于

在C++17中， 对于模版类对象的生成不需要声明模版参数，可以直接进行初始化，模版参数交由编译器去推断

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#include <iostream>
#include <type_traits>
using namespace std;
template <typename T1, typename T2>
class MyClass
{
private:
    T1 t1;
    T2 t2;

public:
    MyClass(T1 t1 = T1(), T2 t2 = T2()) {}

    void printSizeOfDataTypes()
    {
        cout << "\nSize of t1 is " << sizeof(t1) << " bytes." << endl;
        cout << "\nSize of t2 is " << sizeof(t2) << " bytes." << endl;
    }
};

int main ( ) {
    //Until C++14
    MyClass<int, double> obj1;
    obj1.printSizeOfDataTypes( );
    //New syntax in C++17
    MyClass obj2( 1, 10.56 );
    return 0;
}