How can C differentiate between () and {} when init a vector [closed]-CodePudding

#include <iostream>
#include <vector>

int main() {
    std::vector<int> v1(10);
    std::vector<int> v2{10};

    for (int x : v1)
        std::cout << x << ", ";

    std::cout << std::endl;

    for (int x : v2)
        std::cout << x << ", ";
}

makes

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
10,

How can C distinguish between () and {} when initialising a class?

And how can I create a constructor for both () and {} with different meanings?

CodePudding user response：

How can C distinguish between () and {} when initialising a class?

Because they are using different syntaxes, so the compiler can parse them differently and behave accordingly.

how can I create a constructor for both () and {} with different meanings?

Define 2 constructors, making one of them take a std::initializer_list as a parameter. {} will call that constructor. () will call the other one.