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171ed2198d
Summary:
Currently libc++ implements some operations on valarray by using the
resize method. This method has a parameter with a default value.
Because of this, valarray may spuriously construct and destruct
objects of valarray's element type.
This patch fixes this issue and adds corresponding test cases.
Reviewers: EricWF, mclow.lists
Reviewed By: mclow.lists
Subscribers: rogfer01, cfe-commits
Differential Revision: https://reviews.llvm.org/D41992
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@324596 91177308-0d34-0410-b5e6-96231b3b80d8
87 lines
2.3 KiB
C++
87 lines
2.3 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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// <valarray>
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// template<class T> class valarray;
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// valarray& operator=(const valarray& v);
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#include <valarray>
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#include <cassert>
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#include <cstddef>
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struct S
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{
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S() : x_(0) { default_ctor_called = true; }
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S(int x) : x_(x) {}
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int x_;
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static bool default_ctor_called;
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};
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bool S::default_ctor_called = false;
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bool operator==(const S& lhs, const S& rhs)
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{
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return lhs.x_ == rhs.x_;
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}
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int main()
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{
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{
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typedef int T;
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T a[] = {1, 2, 3, 4, 5};
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const unsigned N = sizeof(a)/sizeof(a[0]);
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std::valarray<T> v(a, N);
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std::valarray<T> v2;
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v2 = v;
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assert(v2.size() == v.size());
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for (std::size_t i = 0; i < v2.size(); ++i)
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assert(v2[i] == v[i]);
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}
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{
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typedef double T;
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T a[] = {1, 2.5, 3, 4.25, 5};
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const unsigned N = sizeof(a)/sizeof(a[0]);
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std::valarray<T> v(a, N);
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std::valarray<T> v2;
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v2 = v;
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assert(v2.size() == v.size());
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for (std::size_t i = 0; i < v2.size(); ++i)
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assert(v2[i] == v[i]);
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}
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{
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typedef std::valarray<double> T;
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T a[] = {T(1), T(2), T(3), T(4), T(5)};
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const unsigned N = sizeof(a)/sizeof(a[0]);
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std::valarray<T> v(a, N);
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std::valarray<T> v2(a, N-2);
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v2 = v;
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assert(v2.size() == v.size());
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for (unsigned i = 0; i < N; ++i)
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{
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assert(v2[i].size() == v[i].size());
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for (std::size_t j = 0; j < v[i].size(); ++j)
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assert(v2[i][j] == v[i][j]);
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}
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}
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{
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typedef S T;
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T a[] = {T(1), T(2), T(3), T(4), T(5)};
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const unsigned N = sizeof(a)/sizeof(a[0]);
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std::valarray<T> v(a, N);
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std::valarray<T> v2;
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v2 = v;
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assert(v2.size() == v.size());
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for (std::size_t i = 0; i < v2.size(); ++i)
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assert(v2[i] == v[i]);
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assert(!S::default_ctor_called);
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}
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}
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