view: make methods constexpr
the class is used in some constexpr parsing routines, so constexpr for many methods is required.
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23
view.hpp
23
view.hpp
@ -27,18 +27,25 @@ namespace util {
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public:
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using value_type = typename std::iterator_traits<T>::value_type;
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view (T first, T last);
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template <size_t S>
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constexpr view (const value_type (&arr)[S]) noexcept;
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constexpr view (T first, T last) noexcept;
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T begin (void);
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T end (void);
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constexpr T begin (void) const noexcept;
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constexpr T end (void) const noexcept;
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bool empty (void) const;
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size_t size (void) const;
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constexpr T cbegin (void) const noexcept;
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constexpr T cend (void) const noexcept;
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value_type& operator[] (size_t);
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const value_type& operator[] (size_t) const;
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constexpr T find (value_type) const noexcept;
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bool operator== (view) const;
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constexpr bool empty (void) const noexcept;
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constexpr size_t size (void) const noexcept;
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constexpr value_type& operator[] (size_t) noexcept;
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constexpr const value_type& operator[] (size_t) const noexcept;
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bool operator== (view) const noexcept;
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private:
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T m_begin;
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68
view.ipp
68
view.ipp
@ -25,9 +25,21 @@
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#include <iterator>
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///////////////////////////////////////////////////////////////////////////////
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template <typename T>
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template <size_t S>
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constexpr
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util::view<T>::view (const value_type(&arr)[S]) noexcept:
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m_begin (arr),
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m_end (arr + S)
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{ ; }
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//-----------------------------------------------------------------------------
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template <typename T>
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util::view<T>::view (T _begin, T _end):
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constexpr
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util::view<T>::view (T _begin, T _end) noexcept:
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m_begin (_begin),
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m_end (_end)
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{ ; }
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@ -35,8 +47,26 @@ util::view<T>::view (T _begin, T _end):
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//-----------------------------------------------------------------------------
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template <typename T>
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T
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util::view<T>::begin (void)
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constexpr T
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util::view<T>::begin (void) const noexcept
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{
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return cbegin ();
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}
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//-----------------------------------------------------------------------------
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template <typename T>
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constexpr T
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util::view<T>::end (void) const noexcept
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{
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return cend ();
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}
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//-----------------------------------------------------------------------------
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template <typename T>
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constexpr T
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util::view<T>::cbegin (void) const noexcept
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{
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return m_begin;
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}
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@ -44,8 +74,8 @@ util::view<T>::begin (void)
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//-----------------------------------------------------------------------------
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template <typename T>
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T
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util::view<T>::end (void)
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constexpr T
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util::view<T>::cend (void) const noexcept
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{
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return m_end;
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}
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@ -53,8 +83,20 @@ util::view<T>::end (void)
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///////////////////////////////////////////////////////////////////////////////
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template <typename T>
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bool
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util::view<T>::empty (void) const
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constexpr T
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util::view<T>::find (value_type v) const noexcept
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{
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for (T i = cbegin (); i != cend (); ++i)
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if (*i == v)
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return i;
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return cend ();
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}
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///////////////////////////////////////////////////////////////////////////////
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template <typename T>
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constexpr bool
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util::view<T>::empty (void) const noexcept
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{
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return m_begin == m_end;
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}
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@ -62,17 +104,17 @@ util::view<T>::empty (void) const
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//-----------------------------------------------------------------------------
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template <typename T>
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size_t
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util::view<T>::size (void) const
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constexpr size_t
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util::view<T>::size (void) const noexcept
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{
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return std::distance (m_begin, m_end);
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return m_end - m_begin;
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}
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///////////////////////////////////////////////////////////////////////////////
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template <typename T>
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const typename util::view<T>::value_type&
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util::view<T>::operator[] (size_t idx) const
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constexpr const typename util::view<T>::value_type&
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util::view<T>::operator[] (size_t idx) const noexcept
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{
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CHECK_LT (m_begin + idx, m_end);
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return m_begin[idx];
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@ -82,7 +124,7 @@ util::view<T>::operator[] (size_t idx) const
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///////////////////////////////////////////////////////////////////////////////
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template <typename T>
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bool
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util::view<T>::operator== (const view<T> rhs) const
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util::view<T>::operator== (const view<T> rhs) const noexcept
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{
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return rhs.m_begin == m_begin &&
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rhs.m_end == m_end;
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