在可变模板函数中串联字符串（和数字） [英] Concatenating strings (and numbers) in variadic template function

问题描述

我试图写一个函数，它接受各种字符串或数字（使用 std :: to_string 并连接它们。

I am attempting to write a function that takes a variety of strings or numbers (that work with std::to_string and concatenate them. I've got it working with just strings, but I am having trouble with specializing depending on input as string or number.

我的代码是这样调用的：

My code is called like this:

stringer（hello，world，2，15，0.2014，goodbye，world）

这里是我有：

inline std::string stringer(const std::string &string)
{
    return string;
}

template <typename T, typename... Args>
inline std::string stringer(const std::string &string, T &&val, Args &&...args)
{  
    return stringer(string+std::to_string(val), std::forward<Args>(args)...);
}

template <typename... Args>
inline std::string stringer(const std::string &string, Args &&...args)
{
    return stringer(string, std::forward<Args>(args)...);
}

目前它正在打破任何多个字符串，除非以下都是数字（由于to_string）。我如何专业化基于字符串或数字使上述工作？谢谢。

Currently it is breaking on any more than one string added unless the following are all numbers (due to the to_string). How can I specialize based on string or number to make the above work? Thanks.

推荐答案

inline std::string const& to_string(std::string const& s) { return s; }

template<typename... Args>
std::string stringer(Args const&... args)
{
    std::string result;
    using ::to_string;
    using std::to_string;
    int unpack[]{0, (result += to_string(args), 0)...};
    static_cast<void>(unpack);
    return result;
}

这篇关于在可变模板函数中串联字符串（和数字）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！