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view: add constructors from nullptr_t

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This commit is contained in:
Danny Robson 2017-12-19 18:13:03 +11:00
parent 36902f1476
commit e61c4f6e98
1 changed files with 14 additions and 2 deletions
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16
view.hpp
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@ -56,13 +56,25 @@ namespace util {
//---------------------------------------------------------------------
// technically we could get away without explicitly defining a move
// constructor here, but by nulling rhs we can more easily use this
// class as a base for unique owning pointers without exposing
// begin/end to them directly.
// class as a base for unique owning pointers without exposing the
// begin/end data members to them directly.
constexpr view (view &&rhs) noexcept:
view (std::move (rhs.m_begin), std::move (rhs.m_end))
{ ; }
//---------------------------------------------------------------------
// allow null construction of views where IteratorT is constructible
// from nullptr_t
//
// ideally we would avoid exposing this as it promotes use of nulls but
// it simplifies construction of views that are data members of classes
// when we may not immediately know the values we should contain.
constexpr view (std::nullptr_t) noexcept:
view {nullptr,nullptr}
{ ; }
//---------------------------------------------------------------------
template <typename ContainerT>
constexpr explicit