如何修复 GCC 错误：implicit instantiation of undefined template 'std::basic_stringstream<char>'

问题：

尝试编译 C++ 应用程序时，你看到类似这样的错误消息

error.txt

main.cpp:15:23: error: implicit instantiation of undefined template 'std::basic_stringstream<char>'
    std::stringstream ss;
                      ^

main.cpp:15:23: error: implicit instantiation of undefined template 'std::basic_stringstream<char>'
    std::stringstream ss;
                      ^

在此错误发生的文件顶部，添加以下行：

main.cpp

#include <sstream>

#include <sstream>

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