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//===- IteratorTest.cpp - Unit tests for iterator utilities ---------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/iterator.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
template <int> struct Shadow;
struct WeirdIter : std::iterator<std::input_iterator_tag, Shadow<0>, Shadow<1>,
Shadow<2>, Shadow<3>> {};
struct AdaptedIter : iterator_adaptor_base<AdaptedIter, WeirdIter> {};
// Test that iterator_adaptor_base forwards typedefs, if value_type is
// unchanged.
static_assert(std::is_same<typename AdaptedIter::value_type, Shadow<0>>::value,
"");
static_assert(
std::is_same<typename AdaptedIter::difference_type, Shadow<1>>::value, "");
static_assert(std::is_same<typename AdaptedIter::pointer, Shadow<2>>::value,
"");
static_assert(std::is_same<typename AdaptedIter::reference, Shadow<3>>::value,
"");
TEST(PointeeIteratorTest, Basic) {
int arr[4] = { 1, 2, 3, 4 };
SmallVector<int *, 4> V;
V.push_back(&arr[0]);
V.push_back(&arr[1]);
V.push_back(&arr[2]);
V.push_back(&arr[3]);
typedef pointee_iterator<SmallVectorImpl<int *>::const_iterator> test_iterator;
test_iterator Begin, End;
Begin = V.begin();
End = test_iterator(V.end());
test_iterator I = Begin;
for (int i = 0; i < 4; ++i) {
EXPECT_EQ(*V[i], *I);
EXPECT_EQ(I, Begin + i);
EXPECT_EQ(I, std::next(Begin, i));
test_iterator J = Begin;
J += i;
EXPECT_EQ(I, J);
EXPECT_EQ(*V[i], Begin[i]);
EXPECT_NE(I, End);
EXPECT_GT(End, I);
EXPECT_LT(I, End);
EXPECT_GE(I, Begin);
EXPECT_LE(Begin, I);
EXPECT_EQ(i, I - Begin);
EXPECT_EQ(i, std::distance(Begin, I));
EXPECT_EQ(Begin, I - i);
test_iterator K = I++;
EXPECT_EQ(K, std::prev(I));
}
EXPECT_EQ(End, I);
}
TEST(PointeeIteratorTest, SmartPointer) {
SmallVector<std::unique_ptr<int>, 4> V;
V.push_back(make_unique<int>(1));
V.push_back(make_unique<int>(2));
V.push_back(make_unique<int>(3));
V.push_back(make_unique<int>(4));
typedef pointee_iterator<
SmallVectorImpl<std::unique_ptr<int>>::const_iterator> test_iterator;
test_iterator Begin, End;
Begin = V.begin();
End = test_iterator(V.end());
test_iterator I = Begin;
for (int i = 0; i < 4; ++i) {
EXPECT_EQ(*V[i], *I);
EXPECT_EQ(I, Begin + i);
EXPECT_EQ(I, std::next(Begin, i));
test_iterator J = Begin;
J += i;
EXPECT_EQ(I, J);
EXPECT_EQ(*V[i], Begin[i]);
EXPECT_NE(I, End);
EXPECT_GT(End, I);
EXPECT_LT(I, End);
EXPECT_GE(I, Begin);
EXPECT_LE(Begin, I);
EXPECT_EQ(i, I - Begin);
EXPECT_EQ(i, std::distance(Begin, I));
EXPECT_EQ(Begin, I - i);
test_iterator K = I++;
EXPECT_EQ(K, std::prev(I));
}
EXPECT_EQ(End, I);
}
} // anonymous namespace
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