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view: allow multiple iterator types

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This commit is contained in:
Danny Robson 2017-12-22 12:34:25 +11:00
parent cfe1185621
commit 8d317fd41e
1 changed files with 16 additions and 16 deletions
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32
view.hpp
View File

@ -29,18 +29,18 @@
#include <stdexcept>
namespace util {
template <typename IteratorT>
template <typename IteratorA, typename IteratorB = IteratorA>
struct view {
public:
//---------------------------------------------------------------------
using value_type = typename std::iterator_traits<
remove_restrict_t<IteratorT>
remove_restrict_t<IteratorA>
>::value_type;
//---------------------------------------------------------------------
constexpr
view (const IteratorT &first, const IteratorT &last) noexcept:
view (const IteratorA &first, const IteratorB &last) noexcept:
m_begin (first),
m_end (last)
{ ; }
@ -114,24 +114,24 @@ namespace util {
m_begin = rhs.m_begin;
m_end = rhs.m_end;
rhs.m_begin = IteratorT{};
rhs.m_end = IteratorT{};
rhs.m_begin = IteratorA{};
rhs.m_end = IteratorB{};
return *this;
};
///////////////////////////////////////////////////////////////////////
constexpr IteratorT begin (void) noexcept { return m_begin; }
constexpr IteratorT end (void) noexcept { return m_end; }
constexpr IteratorA begin (void) noexcept { return m_begin; }
constexpr IteratorB end (void) noexcept { return m_end; }
//---------------------------------------------------------------------
constexpr const IteratorT begin (void) const noexcept { return cbegin (); }
constexpr const IteratorT end (void) const noexcept { return cend (); }
constexpr const IteratorA begin (void) const noexcept { return cbegin (); }
constexpr const IteratorB end (void) const noexcept { return cend (); }
//---------------------------------------------------------------------
constexpr const IteratorT cbegin (void) const noexcept { return m_begin; }
constexpr const IteratorT cend (void) const noexcept { return m_end; }
constexpr const IteratorA cbegin (void) const noexcept { return m_begin; }
constexpr const IteratorB cend (void) const noexcept { return m_end; }
//---------------------------------------------------------------------
auto data (void) { return begin (); }
@ -181,8 +181,8 @@ namespace util {
private:
///////////////////////////////////////////////////////////////////////
IteratorT m_begin;
IteratorT m_end;
IteratorA m_begin;
IteratorB m_end;
};
@ -230,11 +230,11 @@ namespace util {
//-------------------------------------------------------------------------
template <typename IteratorT>
template <typename IteratorA, typename IteratorB>
auto
make_view (IteratorT first, IteratorT last)
make_view (IteratorA first, IteratorB last)
{
return view<IteratorT> {first, last};
return view<IteratorA, IteratorB> {first, last};
}
//-------------------------------------------------------------------------