c++从string类型转换为bool类型

参考：https://blog.csdn.net/weixin_30387339/article/details/97729865

注意：当字符串s为“1”时，转换时去掉std::boolalpha。

#include <iostream>
#include <sstream>
        
void print(bool parameter)
{       
    if (parameter) {
        std::cout << "parameter is true" << std::endl;
    }   
    else {
        std::cout << "parameter is false" << std::endl;
    }   
}       
        
int main ()
{       
    bool b = false; 
    print(b);
        
    std::string s = "true";
    std::istringstream(s) >> std::boolalpha >> b;
    print(b);
        
    std::string t = "1";                                                                                                                                               
    std::istringstream(t) >> b;
    print(b);
        
    return 0;
}   

使用std::boolalpha格式化输出：

#include <iostream>
#include <sstream>
        
int main ()
{       
    bool b = false; 
    std::cout << std::boolalpha << b << std::endl;
        
    std::string s = "true";
    std::istringstream(s) >> std::boolalpha >> b;
    std::cout << std::boolalpha << b << std::endl;
        
    std::string t = "1";                                                                                                                                               
    std::istringstream(t) >> b;
    std::cout << std::boolalpha << b << std::endl;
        
    return 0;
}