[英]Which STL Algorithm should i use if I want to find something but Don't want it to return last if not found?
[英]what should I return if I don't have something to return for an unknown type
对于以下代码,如果我没有要返回的内容,应该返回什么? 目前,我做的事情就像T(),但我不确定它是否正确。
template<typename T1, typename T2>
tuple<T1, T2, bool> CBR<T1, T2>::getSomething(T1 t)
{
// here I I don't have something of time T2 or T2 to return
if( ... )
return make_tuple(T1(), T2(), false); // @FIXME
if( ... )
return make_tuple(something.tp, something.ts, false);
else
return make_tuple(something.tp, something.ts, true);
}
boost::optional<tuple<T1, T2, bool> >
“良好”的回归路径将保持不变; “FIXME”将成为:
return boost::none;
这可以允许您的类与不支持默认构造的类型一起使用。
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