51 lines
1.2 KiB
C++
51 lines
1.2 KiB
C++
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//===------ MappedIteratorTest.cpp - Unit tests for mapped_iterator -------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/STLExtras.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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namespace {
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TEST(MappedIteratorTest, ApplyFunctionOnDereference) {
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std::vector<int> V({0});
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auto I = map_iterator(V.begin(), [](int X) { return X + 1; });
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EXPECT_EQ(*I, 1) << "should have applied function in dereference";
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}
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TEST(MappedIteratorTest, ApplyFunctionOnArrow) {
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struct S {
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int Z = 0;
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};
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std::vector<int> V({0});
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S Y;
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S* P = &Y;
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auto I = map_iterator(V.begin(), [&](int X) -> S& { return *(P + X); });
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I->Z = 42;
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EXPECT_EQ(Y.Z, 42) << "should have applied function during arrow";
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}
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TEST(MappedIteratorTest, FunctionPreservesReferences) {
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std::vector<int> V({1});
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std::map<int, int> M({ {1, 1} });
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auto I = map_iterator(V.begin(), [&](int X) -> int& { return M[X]; });
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*I = 42;
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EXPECT_EQ(M[1], 42) << "assignment should have modified M";
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}
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} // anonymous namespace
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