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