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Summary: The expected order of pointer-like keys is hash-function-dependent which in turn depends on the platform/environment. Need to come up with a better way to test reverse iteration of containers with pointer-like keys. Reviewers: dblaikie, mehdi_amini, efriedma, mgrang Reviewed By: mgrang Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D37128 llvm-svn: 311741
56 lines
1.9 KiB
C++
56 lines
1.9 KiB
C++
//===- llvm/unittest/Support/ReverseIterationTest.cpp ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===---------------------------------------------------------------------===//
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//
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// Reverse Iteration unit tests.
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//
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//===---------------------------------------------------------------------===//
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/Support/ReverseIteration.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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TEST(ReverseIterationTest, DenseMapTest1) {
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static_assert(detail::IsPointerLike<int *>::value,
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"int * is pointer-like");
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static_assert(detail::IsPointerLike<uintptr_t>::value,
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"uintptr_t is pointer-like");
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static_assert(!detail::IsPointerLike<int>::value,
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"int is not pointer-like");
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static_assert(detail::IsPointerLike<void *>::value,
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"void * is pointer-like");
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struct IncompleteType;
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static_assert(detail::IsPointerLike<IncompleteType *>::value,
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"incomplete * is pointer-like");
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// For a DenseMap with non-pointer-like keys, forward iteration equals
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// reverse iteration.
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DenseMap<int, int> Map;
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int Keys[] = { 1, 2, 3, 4 };
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// Insert keys into the DenseMap.
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for (auto Key: Keys)
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Map[Key] = 0;
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// Note: This is the observed order of keys in the DenseMap.
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// If there is any change in the behavior of the DenseMap, this order
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// would need to be adjusted accordingly.
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int IterKeys[] = { 2, 4, 1, 3 };
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// Check that the DenseMap is iterated in the expected order.
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for (const auto &Tuple : zip(Map, IterKeys))
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ASSERT_EQ(std::get<0>(Tuple).first, std::get<1>(Tuple));
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// Check operator++ (post-increment).
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int i = 0;
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for (auto iter = Map.begin(), end = Map.end(); iter != end; iter++, ++i)
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ASSERT_EQ(iter->first, IterKeys[i]);
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}
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