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//===------ 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
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