decltype类型推导与auto关键字,原始字面量

#include <iostream>

template<typename T1, typename T2>
auto func(T1 x, T2 y) ->decltype(x + y) {
    // 类型推导
    decltype(x + y) tmp = x + y;
    std::cout << "tmp=" << tmp << std::endl;
    return tmp;
}

int main() {
    auto xxx = func(3, 3.5);
    std::cout << "xxx=" << xxx << std::endl;

    std::string path = "C:\\Program Filesa\\Microsoft OneDrive\\tail";
    std::cout << "path=" << path << std::endl;
    // 使用c++11原始字面量
    std::string path1 = R"(C:\Program Filesa\Microsoft OneDrive\tail)";
    std::cout << "path1=" << path1 << std::endl;
    std::string strXml = R"(
        <no>0001</no>
        <weight>48.5</weight>
        <height>170</height>)";
    std::cout << "strXml=" << strXml << std::endl;
    return 0;
}