我无法理解如何在 C++ 中转发参数包的元素。请以下面的代码为例:
#include <iostream>
void print(const int& value) {
std::cout << "print(const int& value) - " << value << std::endl;
}
void print(int&& value) {
std::cout << "print(int&& value) - " << value << std::endl;
}
template <class... Arg>
void print_each_argument(Arg&&... args) {
for(auto&& a: { args... }) {
print(std::forward<decltype(a)>(a));
}
}
int main() {
int some_value = 10;
int other_value = 20;
print_each_argument(some_value, other_value, 12, 14);
return 0;
}
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输出:
print(const int& value) - 10
print(const int& value) …Run Code Online (Sandbox Code Playgroud) c++ variadic-templates perfect-forwarding c++20 parameter-pack