我们如何在屏幕上打印数据并同时将其保存为文本?
ofstream helloworld;
string hello ="welcome";
helloworld.open("helloworld.txt");
**helloworld << hello <<endl;
cout << hello << endl;**
有没有办法同时打印和写文件?
cout&&helloworld <<hello<< endl;
答案 0 :(得分:2)
你可以通过使用辅助类和函数来实现它。
// The class
struct my_out
{
my_out(std::ostream& out1, std::ostream& out2) : out1_(out1), out2_(out2) {}
std::ostream& out1_;
std::ostream& out2_;
};
// operator<<() function for most data types.
template <typename T>
my_out& operator<<(my_out& mo, T const& t)
{
mo.out1_ << t;
mo.out2_ << t;
return mo;
}
// Allow for std::endl to be used with a my_out
my_out& operator<<(my_out& mo, std::ostream&(*f)(std::ostream&))
{
mo.out1_ << f;
mo.out2_ << f;
return mo;
}
您必须添加类似的辅助函数来处理来自<iomanip>
的对象。
将其用作:
std::ofstream helloworld;
helloworld.open("helloworld.txt");
my_out mo(std::cout, hellowworld);
string hello ="welcome";
mo << hello << std::endl;