You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
49 lines
1.6 KiB
49 lines
1.6 KiB
// -*-c++-*-
|
|
// vim: set ft=cpp:
|
|
|
|
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
|
|
file Copyright.txt or https://cmake.org/licensing for details. */
|
|
#pragma once
|
|
|
|
#include <iterator>
|
|
|
|
#include <cm/type_traits>
|
|
|
|
namespace cm {
|
|
|
|
// checks if a type is an iterator type
|
|
template <typename I>
|
|
using is_iterator =
|
|
std::is_integral<typename std::iterator_traits<I>::difference_type>;
|
|
|
|
// checks if a type is an input iterator type
|
|
template <typename I>
|
|
using is_input_iterator =
|
|
std::is_base_of<std::input_iterator_tag,
|
|
typename std::iterator_traits<I>::iterator_category>;
|
|
|
|
// checks if a type is a range type: std::begin() and std::end() are supported
|
|
template <typename Range>
|
|
using is_range = cm::bool_constant<
|
|
cm::is_iterator<decltype(std::begin(std::declval<const Range>()))>::value &&
|
|
cm::is_iterator<decltype(std::end(std::declval<const Range>()))>::value>;
|
|
|
|
// checks if a type is an input range type: std::begin() and std::end() are
|
|
// returning an input iterator
|
|
template <typename Range>
|
|
using is_input_range =
|
|
#if defined(_MSC_VER) && _MSC_VER < 1920
|
|
// MS C++ is not able to evaluate complex type introspection,
|
|
// so use a simplified version
|
|
cm::bool_constant<std::is_class<Range>::value ||
|
|
std::is_pointer<Range>::value ||
|
|
std::is_array<Range>::value>;
|
|
#else
|
|
cm::bool_constant<cm::is_input_iterator<decltype(std::begin(
|
|
std::declval<const Range>()))>::value &&
|
|
cm::is_input_iterator<decltype(std::end(
|
|
std::declval<const Range>()))>::value>;
|
|
#endif
|
|
|
|
} // namespace cm
|