libcruft-util/view.ipp

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/*
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* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
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* http://www.apache.org/licenses/LICENSE-2.0
*
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* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright 2015 Danny Robson <danny@nerdcruft.net>
*/
#ifdef __UTIL_VIEW_IPP
#error
#endif
#define __UTIL_VIEW_IPP
#include "./debug.hpp"
#include "./iterator.hpp"
///////////////////////////////////////////////////////////////////////////////
template <typename T>
constexpr
util::view<T>::view (T _begin, T _end) noexcept:
m_begin (_begin),
m_end (_end)
{ ; }
//-----------------------------------------------------------------------------
template <typename T>
template <typename K>
constexpr
util::view<T>::view (K &data):
m_begin (std::begin (data)),
m_end (std::end (data))
{ ; }
//-----------------------------------------------------------------------------
template <typename T>
template <typename K>
constexpr
util::view<T>::view (const K &data):
m_begin (std::begin (data)),
m_end (std::end (data))
{ ; }
///////////////////////////////////////////////////////////////////////////////
template <typename T>
constexpr T&
util::view<T>::begin (void) noexcept
{
return m_begin;
}
//-----------------------------------------------------------------------------
template <typename T>
constexpr T&
util::view<T>::end (void) noexcept
{
return m_end;
}
//-----------------------------------------------------------------------------
template <typename T>
constexpr const T&
util::view<T>::begin (void) const noexcept
{
return cbegin ();
}
//-----------------------------------------------------------------------------
template <typename T>
constexpr const T&
util::view<T>::end (void) const noexcept
{
return cend ();
}
//-----------------------------------------------------------------------------
template <typename T>
constexpr const T&
util::view<T>::cbegin (void) const noexcept
{
return m_begin;
}
//-----------------------------------------------------------------------------
template <typename T>
constexpr const T&
util::view<T>::cend (void) const noexcept
{
return m_end;
}
///////////////////////////////////////////////////////////////////////////////
template <typename T>
constexpr T
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util::view<T>::find (const value_type &v) const noexcept
{
for (T i = cbegin (); i != cend (); ++i)
if (*i == v)
return i;
return cend ();
}
///////////////////////////////////////////////////////////////////////////////
template <typename T>
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constexpr
bool
util::view<T>::empty (void) const noexcept
{
return m_begin == m_end;
}
//-----------------------------------------------------------------------------
template <typename T>
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constexpr
size_t
util::view<T>::size (void) const noexcept
{
return m_end - m_begin;
}
///////////////////////////////////////////////////////////////////////////////
template <typename T>
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constexpr
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const typename util::view<T>::value_type&
util::view<T>::operator[] (size_t idx) const noexcept
{
return m_begin[idx];
}
//-----------------------------------------------------------------------------
template <typename T>
constexpr
typename util::view<T>::value_type&
util::view<T>::operator[] (size_t idx) noexcept
{
return m_begin[idx];
}
///////////////////////////////////////////////////////////////////////////////
template <typename T>
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bool
util::view<T>::operator== (const view<T> rhs) const noexcept
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{
return rhs.m_begin == m_begin &&
rhs.m_end == m_end;
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}
///////////////////////////////////////////////////////////////////////////////
template <typename T, size_t N>
auto
util::make_view (const T (&arr)[N])
{
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return util::view<const T*> (arr + 0, arr + N);
}
//-----------------------------------------------------------------------------
template <typename T>
auto
util::make_view (T &t)
{
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return util::view<decltype(std::begin (t))> { std::begin (t), std::end (t) };
}
//-----------------------------------------------------------------------------
template <typename T>
auto
util::make_view (const T &t)
{
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return util::view<decltype(std::cbegin (t))> { std::cbegin (t), std::cend (t) };
}
//-----------------------------------------------------------------------------
template <typename T>
auto
util::make_cview (const T &t)
{
return util::view<decltype(std::cbegin (t))> { std::cbegin (t), std::cend (t) };
}