c++ - 为什么这个初始化列表不能匹配模板参数？

Question

#include <iostream>

class Foo
{
public:

    template <typename Container>
    Foo (const Container & args)
    {
        for (auto arg : args)
            std::cout << "ARG(" << arg << ")\n";
    }
};

int main ()
{
    Foo foo ({"foo", "bar", "baz"});
}

错误(使用g++ -std=c++17)是

error: no matching function for call to ‘Foo::Foo(<brace-enclosed initializer list>)’

这行得通

Foo foo (std::vector<const char*> ({"foo", "bar", "baz"}));

为什么初始化列表不能匹配模板构造函数？

Answer 1

{"foo", "bar", "baz"}没有类型，所以不能推导

template <typename Container>
Foo (const Container&);

您只能将其用于扣除

template <typename T>
Foo (const std::initializer_list<T>&);