c ++ 11递归可变模板 [英] c++11 recursive variadic templates

问题描述

我想了解递归变量模板如何工作。

I am trying to understand how recursive variadic templates work.

#include <iostream>

template<typename T>
static inline void WriteLog(T&& msg) {
    std::wcout << std::forward<T>(msg);
}

template<typename T, typename... Ts>
static void WriteLog(T&& msg, Ts&&... Vals) {
    WriteLog(std::forward<T>(msg));
    WriteLog(std::forward<Ts>(Vals)...);
    std::wcout << "\n**End**";
}

int main() {
    WriteLog("apple, ", "orange, ", "mango");
}

输出：

apple, orange, mango
**End**
**End**

我期望只有一个 **结束** 。为什么会打印两次？

I expected only one **End**. Why is it printed twice?

推荐答案

调用树：

 WriteLog("apple, ", "orange, ", "mango");
       ->WriteLog("apple, ");
            -> std::wcout << "apple, ";
       ->WriteLog( "orange, ", "mango");
            ->WriteLog("orange, ");
                 -> std::wcout << "orange, ";
            ->WriteLog( "mango");
                 -> std::wcout << "mango";
            ->std::wcout << "\n**End**";
       ->std::wcout << "\n**End**";

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