[英]using setw with user-defined ostream operators
How do I make setw or something similar (boost format?) work with my user-defined ostream operators? 如何设置setw或类似的东西(提升格式?)与我的用户定义的ostream操作符一起使用? setw only applies to the next element pushed to the stream.
setw仅适用于推送到流的下一个元素。
For example: 例如:
cout << " approx: " << setw(10) << myX;
where myX is of type X, and I have my own 其中myX是X型,我有自己的
ostream& operator<<(ostream& os, const X &g) {
return os << "(" << g.a() << ", " << g.b() << ")";
}
Just make sure that all your output is sent to the stream as part of the same call to operator<<
. 只需确保将所有输出作为对
operator<<
的同一调用的一部分发送到流中。 A straightforward way to achieve this is to use an auxiliary ostringstream
object: 实现此目的的直接方法是使用辅助
ostringstream
对象:
#include <sstream>
ostream& operator<<(ostream& os, const X & g) {
ostringstream oss;
oss << "(" << g.a() << ", " << g.b() << ")";
return os << oss.str();
}
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