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7c3769df62
to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@351648 91177308-0d34-0410-b5e6-96231b3b80d8
80 lines
3.5 KiB
C++
80 lines
3.5 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++98, c++03, c++11
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// <utility>
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// class make_integer_sequence
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#include <tuple>
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#include <utility>
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#include <type_traits>
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#include <cassert>
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template <typename AtContainer, typename T, T... I>
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auto extract ( const AtContainer &t, const std::integer_sequence<T, I...> )
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-> decltype ( std::make_tuple ( std::get<I>(t)... ))
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{ return std::make_tuple ( std::get<I>(t)... ); }
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int main()
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{
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// Make a couple of sequences
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using int3 = std::make_integer_sequence<int, 3>; // generates int: 0,1,2
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using size7 = std::make_integer_sequence<size_t, 7>; // generates size_t: 0,1,2,3,4,5,6
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using size4 = std::make_index_sequence<4>; // generates size_t: 0,1,2,3
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using size2 = std::index_sequence_for<int, size_t>; // generates size_t: 0,1
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using intmix = std::integer_sequence<int, 9, 8, 7, 2>; // generates int: 9,8,7,2
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using sizemix = std::index_sequence<1, 1, 2, 3, 5>; // generates size_t: 1,1,2,3,5
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// Make sure they're what we expect
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static_assert ( std::is_same<int3::value_type, int>::value, "int3 type wrong" );
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static_assert ( int3::size () == 3, "int3 size wrong" );
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static_assert ( std::is_same<size7::value_type, size_t>::value, "size7 type wrong" );
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static_assert ( size7::size () == 7, "size7 size wrong" );
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static_assert ( std::is_same<size4::value_type, size_t>::value, "size4 type wrong" );
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static_assert ( size4::size () == 4, "size4 size wrong" );
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static_assert ( std::is_same<size2::value_type, size_t>::value, "size2 type wrong" );
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static_assert ( size2::size () == 2, "size2 size wrong" );
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static_assert ( std::is_same<intmix::value_type, int>::value, "intmix type wrong" );
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static_assert ( intmix::size () == 4, "intmix size wrong" );
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static_assert ( std::is_same<sizemix::value_type, size_t>::value, "sizemix type wrong" );
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static_assert ( sizemix::size () == 5, "sizemix size wrong" );
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auto tup = std::make_tuple ( 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 );
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// Use them
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auto t3 = extract ( tup, int3() );
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static_assert ( std::tuple_size<decltype(t3)>::value == int3::size (), "t3 size wrong");
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assert ( t3 == std::make_tuple ( 10, 11, 12 ));
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auto t7 = extract ( tup, size7 ());
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static_assert ( std::tuple_size<decltype(t7)>::value == size7::size (), "t7 size wrong");
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assert ( t7 == std::make_tuple ( 10, 11, 12, 13, 14, 15, 16 ));
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auto t4 = extract ( tup, size4 ());
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static_assert ( std::tuple_size<decltype(t4)>::value == size4::size (), "t4 size wrong");
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assert ( t4 == std::make_tuple ( 10, 11, 12, 13 ));
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auto t2 = extract ( tup, size2 ());
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static_assert ( std::tuple_size<decltype(t2)>::value == size2::size (), "t2 size wrong");
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assert ( t2 == std::make_tuple ( 10, 11 ));
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auto tintmix = extract ( tup, intmix ());
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static_assert ( std::tuple_size<decltype(tintmix)>::value == intmix::size (), "tintmix size wrong");
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assert ( tintmix == std::make_tuple ( 19, 18, 17, 12 ));
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auto tsizemix = extract ( tup, sizemix ());
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static_assert ( std::tuple_size<decltype(tsizemix)>::value == sizemix::size (), "tsizemix size wrong");
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assert ( tsizemix == std::make_tuple ( 11, 11, 12, 13, 15 ));
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}
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