81 lines
3.5 KiB
C++
81 lines
3.5 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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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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