如何声明ranges-v3视图返回值?

因为C++14可以使用 auto 作为函数的返回类型,将推导出:

auto f() {
    return ranges::view::reverse | ranges::view::filter([](int l){return l>5;});
}
// f's return type is the type of the return expression, exactly as is I had:
// auto returnValue = return-expression;
// where f's type is decltype(returnValue)

唯一的缺点是 f