ranges::v3::safe_begin_fn Struct Reference

Public Member Functions
template<typename Rng , typename I = decltype(begin(std::declval<Rng &>()))>
constexpr meta::if_< std::is_lvalue_reference< Rng >, I, dangling< I > >	operator() (Rng &&rng) const

Member Function Documentation

template<typename Rng , typename I = decltype(begin(std::declval<Rng &>()))>

constexpr meta::if_<std::is_lvalue_reference<Rng>, I, dangling<I> > ranges::v3::safe_begin_fn::operator()

(

Rng &&

rng

)

const

Returns

begin(rng) if rng is an lvalue; otherwise, it returns begin(rng) wrapped in ranges::dangling.

References ranges::v3::begin.