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https://github.com/Gericom/teak-llvm.git
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10b9a1bb42
This patch attempts to improve the QoI of std::tuples tuple_element and __make_tuple_types helpers. Previously they required O(N) instantiations, one for every element in the tuple The new implementations are O(1) after __tuple_indices<Id...> is created. llvm-svn: 274330
35 lines
953 B
C++
35 lines
953 B
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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// <tuple>
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// template <class... Types> class tuple;
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// template <size_t I, class... Types>
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// class tuple_element<I, tuple<Types...> >
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// {
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// public:
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// typedef Ti type;
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// };
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// UNSUPPORTED: c++98, c++03
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#include <tuple>
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#include <type_traits>
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int main()
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{
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using T = std::tuple<int, long, void*>;
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using E1 = typename std::tuple_element<1, T &>::type; // expected-error{{undefined template}}
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using E2 = typename std::tuple_element<3, T>::type;
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using E3 = typename std::tuple_element<4, T const>::type;
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// expected-error@__tuple:* 2 {{static_assert failed}}
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}
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