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f8fa757956
Summary: This eliminates the boilerplate implementation of the iterator interface in mapped_iterator. This patch also adds unit tests that verify that the mapped function is applied by operator* and operator->, and that references returned by the map function are returned via operator*. Reviewers: dblaikie, chandlerc Subscribers: llvm-commits, mgorny Differential Revision: https://reviews.llvm.org/D39855 llvm-svn: 317902
52 lines
1.2 KiB
C++
52 lines
1.2 KiB
C++
//===------ MappedIteratorTest.cpp - Unit tests for mapped_iterator -------===//
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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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#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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