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百度百科模板类https://baike.baidu.com/item/%E6%A8%A1%E6%9D%BF%E7%B1%BBC++ 类模板与模板类详解 https://www.cnblogs.com/cxq0017/p/6076856.html

依次看这三篇文章：typedef函数指针用法https://blog.youkuaiyun.com/qll125596718/article/details/6891881函数指针与回调函数 https://www.runoob.com/cprogramming/c-fun-pointer-callback.html回调函数（callback）是什么？ - no.body的回答 - 知乎 http...

{ float test = 1.234; std::stringstream ss; ss << test; std::string str_test; str_test = ss.str(); std::cout<< ss.s...