libcruft-util/view.hpp
Danny Robson 34788756d2 build: don't use './' as an include prefix
GCC produces ODR error when including paths of the form './foo' and
'foo' in the same binary. Rather than managing duplication we just
universally pick the absolute form over the relative form.
2017-11-22 16:49:37 +11:00

139 lines
3.8 KiB
C++

/*
* 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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 2015-2016 Danny Robson <danny@nerdcruft.net>
*/
#ifndef __UTIL_VIEW_HPP
#define __UTIL_VIEW_HPP
#include "types/traits.hpp"
#include <cstdlib>
#include <ostream>
#include <string>
namespace util {
template <typename T>
struct view {
public:
using value_type = typename std::iterator_traits<remove_restrict_t<T>>::value_type;
constexpr
view (T first, T last) noexcept;
template <typename K> constexpr explicit view ( K &klass);
template <typename K> constexpr explicit view (const K &klass);
constexpr T& begin (void) noexcept;
constexpr T& end (void) noexcept;
constexpr const T& begin (void) const noexcept;
constexpr const T& end (void) const noexcept;
constexpr const T& cbegin (void) const noexcept;
constexpr const T& cend (void) const noexcept;
constexpr T find (const value_type&) const noexcept;
constexpr bool empty (void) const noexcept;
constexpr size_t size (void) const noexcept;
constexpr value_type& operator[] (size_t) noexcept;
constexpr const value_type& operator[] (size_t) const noexcept;
bool operator== (view) const noexcept;
private:
T m_begin;
T m_end;
};
template <typename T, size_t N>
auto
make_view (const T (&)[N]);
template <typename T>
auto
make_view (T&);
template <typename T>
auto
make_view (const T&);
template <typename T>
auto
make_view (T&&) = delete;
template <typename T>
auto
make_cview (const T&);
template <typename T>
auto
make_view (T first, T last)
{
return view<T> {first, last};
}
template <typename T>
auto
make_cview (T *first, T *last)
{
return view<const T*> {first, last};
}
// string conversions
view<const char*> make_view (const char *str);
view<char*> make_view (char *str);
template <typename CharT, typename TraitsT, typename AllocT>
view<const CharT*>
make_view (const std::basic_string<CharT,TraitsT,AllocT>&);
template <typename CharT, typename TraitsT, typename AllocT>
view<CharT*>
make_view (std::basic_string<CharT,TraitsT,AllocT>&);
template <typename CharT, typename TraitsT, typename AllocT>
view<const CharT*>
make_view (const std::basic_string<CharT,TraitsT,AllocT>&&) = delete;
template <typename CharT, typename TraitsT, typename AllocT>
view<CharT*>
make_view (std::basic_string<CharT,TraitsT,AllocT>&&) = delete;
// boolean operationrs
template <typename T>
bool operator!= (view<T>, view<T>);
bool operator== (const std::string&, view<const char*>);
bool operator== (const std::string&, view<char*>);
bool operator== (const std::string&, view<std::string::const_iterator>);
bool operator== (const std::string&, view<std::string::iterator>);
bool operator== (view<const char*>, const std::string&);
bool operator== (view<char*>, const std::string&);
bool operator== (view<std::string::const_iterator>, const std::string&);
bool operator== (view<std::string::iterator>, const std::string&);
template <typename T>
std::ostream&
operator<< (std::ostream&, view<T>);
}
#include "view.ipp"
#endif