#include <iostream>
 
int main()
{
    // 1. OK
    auto str1 = std::string("abc");
    std::cout << str1.c_str() << std::endl;
 
    // 2. NG
    auto str2 = std::string("abc").c_str();
    std::cout << str2 << std::endl;
 
    // 22. NG
    const char* str22;
    {
    	std::string tmp = std::string("abc");
		str22 = tmp.c_str();
    }
    std::cout << str22 << std::endl;
 
 
    // 3. OK
    std::cout << std::string("abc").c_str() << std::endl;
    return 0;
}
 

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