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Diffstat (limited to 'Ix/CPP/src/cpplinq/linq_take.hpp')
-rw-r--r-- | Ix/CPP/src/cpplinq/linq_take.hpp | 98 |
1 files changed, 0 insertions, 98 deletions
diff --git a/Ix/CPP/src/cpplinq/linq_take.hpp b/Ix/CPP/src/cpplinq/linq_take.hpp deleted file mode 100644 index a7093ef..0000000 --- a/Ix/CPP/src/cpplinq/linq_take.hpp +++ /dev/null @@ -1,98 +0,0 @@ -// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information. - -#if !defined(CPPLINQ_LINQ_TAKE_HPP) -#define CPPLINQ_LINQ_TAKE_HPP -#pragma once - -#include <cstddef> - -namespace cpplinq -{ - template <class InnerCursor> - struct linq_take_cursor - { - typedef typename InnerCursor::element_type element_type; - typedef typename InnerCursor::reference_type reference_type; - typedef typename InnerCursor::cursor_category cursor_category; - - linq_take_cursor(const InnerCursor& cur, std::size_t rem) : cur(cur), rem(rem) {} - - void forget() { cur.forget(); } - bool empty() const { return cur.empty() || rem == 0; } - void inc() { cur.inc(); --rem; } - reference_type get() const { return cur.get(); } - - bool atbegin() const { return cur.atbegin(); } - void dec() { cur.dec(); --rem; } - - void skip(std::size_t n) { cur.skip(n); rem -= n; } - std::size_t position() const { return cur.position(); } - std::size_t size() const { return cur.size(); } - - private: - InnerCursor cur; - std::size_t rem; - }; - - namespace detail { - template <class Collection> - linq_take_cursor<typename Collection::cursor> - take_get_cursor_( - const Collection& c, - std::size_t n, - onepass_cursor_tag - ) - { - return linq_take_cursor<typename Collection::cursor>(c.get_cursor(), n); - } - - template <class Collection> - typename Collection::cursor - take_get_cursor_( - const Collection& c, - std::size_t n, - random_access_cursor_tag - ) - { - auto cur = c.get_cursor(); - if (cur.size() > n) { - cur.truncate(n); - } - return cur; - } - } - - template <class Collection> - struct linq_take - { - typedef typename std::conditional< - util::less_or_equal_cursor_category< - random_access_cursor_tag, - typename Collection::cursor::cursor_category>::value, - typename Collection::cursor, - linq_take_cursor<typename Collection::cursor>>::type - cursor; - - linq_take(const Collection& c, std::size_t n) : c(c), n(n) {} - - cursor get_cursor() const { - return detail::take_get_cursor_(c, n, typename Collection::cursor::cursor_category()); - } - - Collection c; - std::size_t n; - }; - - template <class Collection> - auto get_cursor( - const linq_take<Collection>& take - ) - -> decltype(get_cursor_(take, typename Collection::cursor::cursor_category())) - { - return get_cursor_(take, typename Collection::cursor::cursor_category()); - } - - -} -#endif // !defined(CPPLINQ_LINQ_TAKE_HPP) - |