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https://github.com/Gericom/teak-llvm.git
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a0d87857e0
Instead of storing double in double and then truncating to int, store int in long and then widen to long long. This preserves test coverage (as these tests are interested in various tuple conversions) while avoiding truncation warnings. test/std/utilities/tuple/tuple.tuple/tuple.cnstr/const_pair.pass.cpp Since we aren't physically truncating anymore, t1 is equal to p0. test/std/utilities/tuple/tuple.tuple/tuple.cnstr/convert_copy.pass.cpp One edit is different from the usual pattern. Previously, we were storing double in double and then converting to A, which has an implicitly converting constructor from int. Now, we're storing int in int and then converting to A, avoiding the truncation. Fixes D27542. llvm-svn: 289109
111 lines
2.7 KiB
C++
111 lines
2.7 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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// <tuple>
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// template <class... Types> class tuple;
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// template <class... UTypes>
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// tuple& operator=(tuple<UTypes...>&& u);
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// UNSUPPORTED: c++98, c++03
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#include <tuple>
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#include <string>
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#include <memory>
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#include <utility>
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#include <cassert>
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struct B
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{
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int id_;
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explicit B(int i= 0) : id_(i) {}
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virtual ~B() {}
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};
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struct D
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: B
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{
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explicit D(int i) : B(i) {}
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};
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struct E {
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E() = default;
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E& operator=(int) {
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return *this;
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}
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};
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int main()
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{
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{
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typedef std::tuple<long> T0;
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typedef std::tuple<long long> T1;
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T0 t0(2);
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T1 t1;
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t1 = std::move(t0);
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assert(std::get<0>(t1) == 2);
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}
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{
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typedef std::tuple<long, char> T0;
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typedef std::tuple<long long, int> T1;
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T0 t0(2, 'a');
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T1 t1;
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t1 = std::move(t0);
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assert(std::get<0>(t1) == 2);
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assert(std::get<1>(t1) == int('a'));
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}
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{
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typedef std::tuple<long, char, D> T0;
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typedef std::tuple<long long, int, B> T1;
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T0 t0(2, 'a', D(3));
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T1 t1;
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t1 = std::move(t0);
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assert(std::get<0>(t1) == 2);
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assert(std::get<1>(t1) == int('a'));
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assert(std::get<2>(t1).id_ == 3);
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}
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{
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D d(3);
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D d2(2);
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typedef std::tuple<long, char, D&> T0;
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typedef std::tuple<long long, int, B&> T1;
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T0 t0(2, 'a', d2);
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T1 t1(1, 'b', d);
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t1 = std::move(t0);
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assert(std::get<0>(t1) == 2);
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assert(std::get<1>(t1) == int('a'));
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assert(std::get<2>(t1).id_ == 2);
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}
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{
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typedef std::tuple<long, char, std::unique_ptr<D>> T0;
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typedef std::tuple<long long, int, std::unique_ptr<B>> T1;
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T0 t0(2, 'a', std::unique_ptr<D>(new D(3)));
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T1 t1;
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t1 = std::move(t0);
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assert(std::get<0>(t1) == 2);
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assert(std::get<1>(t1) == int('a'));
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assert(std::get<2>(t1)->id_ == 3);
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}
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{
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// Test that tuple evaluates correctly applies an lvalue reference
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// before evaluating is_assignable (ie 'is_assignable<int&, int&&>')
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// instead of evaluating 'is_assignable<int&&, int&&>' which is false.
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int x = 42;
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int y = 43;
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std::tuple<int&&, E> t(std::move(x), E{});
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std::tuple<int&&, int> t2(std::move(y), 44);
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t = std::move(t2);
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assert(std::get<0>(t) == 43);
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assert(&std::get<0>(t) == &x);
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}
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}
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