英文:
Passing a variable of any type for a custom print-debugging implementation
问题
我正在为学校作业实现一个打印调试系统。如果答案很明显，我很抱歉，因为我仍在学习C++。
我想要创建一个函数，它接受三个参数：一个错误信息，一个变量名和变量本身，并将这些信息记录在某个地方，以便以后查看。它将工作如下：
int bad_variable = 2;
debug_log("Variable unexpected value", "bad_variable", bad_variable);
问题是，当将 bad_variable 传递给 debug_log 时，我不知道应该期望什么类型的变量，因此无法定义它。据我所知，没有办法解析未知类型的变量... 但是C++标准库在函数 std::to_string 中正是这样做的！
std::to_string 可能是解决我的问题的答案，我可以将 bad_variable 传递给 std::to_string 来将其转换为字符串，然后让 debug_log 期望输出字符串。但是，每次调用日志函数时都必须键入 std::to_string，对我来说似乎是一个拼凑的解决方案，而一定有更简单的答案。我希望保持这个调试函数尽可能简单。如何创建一个函数，它接受未知类型的变量，并生成包含该变量值的字符串？
英文:
I am implementing a print debugging system for a school assignment. I apologize if the answer is obvious, I am still learning c++.
I want to create a function, that takes three parameters: an error, a variable name, and the variable itself, and logs such information somewhere that can be viewed later. It would work like this:
int bad_variable = 2;
debug_log("Variable unexpected value", "bad_variable", bad_variable);
The problem is, I would have no idea what type of variable to expect when parsing bad_variable to debug_log, and therefore it cannot be defined. To my knowledge there is no way to parse a variable of an unknown type... however the c++ standard library does just that in the function std::to_string!
std::to_string could be the answer to my problem, I could just pass my bad_variable into std::to_string to convert it to a string, having debug_log expect the output string. However, I would have to type std::to_string every time I called the log function.
debug_log("Variable unexpected value", "bad_variable", std::to_string(bad_variable));
This to me seems like a patchwork solution to something that must have a simpler answer. I want to keep this debug function as simplistic as possible. How could I create a function that takes an unknown variable type, and generates a string containing the value of that variable?
答案1
得分: 1
如何创建一个函数，该函数接受未知变量类型，并生成包含该变量值的字符串？
由于您已经标记了这个问题为C++，一种不错的方法是使用模板：
template<typename T>
std::string convToString(T value) {
std::ostringstream oss;
oss << value;
return oss.str();
}
英文:
> How could I create a function that takes an unknown variable type, and generates a string containing the value of that variable?
Since you've tagged this question C++, one nice way of doing so is by using templates:
template<typename t_value>
string convToString(t_value value) {
std::ostringstream oss;
oss << value;
return oss.str();
}
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