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