是否有与"for ... else"等价的内容? C ++中的Python循环? [英] Is there an equivalent to the "for ... else" Python loop in C++?

问题描述

Python有一个有趣的for语句，可用于指定else子句.

Python has an interesting for statement which lets you specify an else clause.

在这样的结构中:

for i in foo:
  if bar(i):
    break
else:
  baz()

else子句在for之后执行，但前提是for正常终止(而不是break终止).

the else clause is executed after the for, but only if the for terminates normally (not by a break).

我想知道C ++中是否有等效的东西?我可以使用for ... else吗?

I wondered if there was an equivalent in C++? Can I use for ... else?

推荐答案

一种表达实际逻辑的简单方法是使用 std::none_of :

A simpler way to express your actual logic is with std::none_of:

if (std::none_of(std::begin(foo), std::end(foo), bar))
    baz();

如果C ++ 17的范围建议被接受，则希望可以简化为:

If the range proposal for C++17 gets accepted, hopefully this will simplify to:

if (std::none_of(foo, bar)) baz();

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