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//===- unittests/ADT/IListIteratorTest.cpp - ilist_iterator unit tests ----===//
//
// 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/simple_ilist.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
struct Node : ilist_node<Node> {};
TEST(IListIteratorTest, DefaultConstructor) {
simple_ilist<Node>::iterator I;
simple_ilist<Node>::reverse_iterator RI;
simple_ilist<Node>::const_iterator CI;
simple_ilist<Node>::const_reverse_iterator CRI;
EXPECT_EQ(nullptr, I.getNodePtr());
EXPECT_EQ(nullptr, CI.getNodePtr());
EXPECT_EQ(nullptr, RI.getNodePtr());
EXPECT_EQ(nullptr, CRI.getNodePtr());
EXPECT_EQ(I, I);
EXPECT_EQ(I, CI);
EXPECT_EQ(CI, I);
EXPECT_EQ(CI, CI);
EXPECT_EQ(RI, RI);
EXPECT_EQ(RI, CRI);
EXPECT_EQ(CRI, RI);
EXPECT_EQ(CRI, CRI);
EXPECT_EQ(I, RI.getReverse());
EXPECT_EQ(RI, I.getReverse());
}
TEST(IListIteratorTest, Empty) {
simple_ilist<Node> L;
// Check iterators of L.
EXPECT_EQ(L.begin(), L.end());
EXPECT_EQ(L.rbegin(), L.rend());
// Reverse of end should be rend (since the sentinel sits on both sides).
EXPECT_EQ(L.end(), L.rend().getReverse());
EXPECT_EQ(L.rend(), L.end().getReverse());
// Iterators shouldn't match default constructors.
simple_ilist<Node>::iterator I;
simple_ilist<Node>::reverse_iterator RI;
EXPECT_NE(I, L.begin());
EXPECT_NE(I, L.end());
EXPECT_NE(RI, L.rbegin());
EXPECT_NE(RI, L.rend());
}
TEST(IListIteratorTest, OneNodeList) {
simple_ilist<Node> L;
Node A;
L.insert(L.end(), A);
// Check address of reference.
EXPECT_EQ(&A, &*L.begin());
EXPECT_EQ(&A, &*L.rbegin());
// Check that the handle matches.
EXPECT_EQ(L.rbegin().getNodePtr(), L.begin().getNodePtr());
// Check iteration.
EXPECT_EQ(L.end(), ++L.begin());
EXPECT_EQ(L.begin(), --L.end());
EXPECT_EQ(L.rend(), ++L.rbegin());
EXPECT_EQ(L.rbegin(), --L.rend());
// Check conversions.
EXPECT_EQ(L.rbegin(), L.begin().getReverse());
EXPECT_EQ(L.begin(), L.rbegin().getReverse());
}
TEST(IListIteratorTest, TwoNodeList) {
simple_ilist<Node> L;
Node A, B;
L.insert(L.end(), A);
L.insert(L.end(), B);
// Check order.
EXPECT_EQ(&A, &*L.begin());
EXPECT_EQ(&B, &*++L.begin());
EXPECT_EQ(L.end(), ++++L.begin());
EXPECT_EQ(&B, &*L.rbegin());
EXPECT_EQ(&A, &*++L.rbegin());
EXPECT_EQ(L.rend(), ++++L.rbegin());
// Check conversions.
EXPECT_EQ(++L.rbegin(), L.begin().getReverse());
EXPECT_EQ(L.rbegin(), (++L.begin()).getReverse());
EXPECT_EQ(++L.begin(), L.rbegin().getReverse());
EXPECT_EQ(L.begin(), (++L.rbegin()).getReverse());
}
TEST(IListIteratorTest, CheckEraseForward) {
simple_ilist<Node> L;
Node A, B;
L.insert(L.end(), A);
L.insert(L.end(), B);
// Erase nodes.
auto I = L.begin();
EXPECT_EQ(&A, &*I);
L.remove(*I++);
EXPECT_EQ(&B, &*I);
L.remove(*I++);
EXPECT_EQ(L.end(), I);
}
TEST(IListIteratorTest, CheckEraseReverse) {
simple_ilist<Node> L;
Node A, B;
L.insert(L.end(), A);
L.insert(L.end(), B);
// Erase nodes.
auto RI = L.rbegin();
EXPECT_EQ(&B, &*RI);
L.remove(*RI++);
EXPECT_EQ(&A, &*RI);
L.remove(*RI++);
EXPECT_EQ(L.rend(), RI);
}
TEST(IListIteratorTest, ReverseConstructor) {
simple_ilist<Node> L;
const simple_ilist<Node> &CL = L;
Node A, B;
L.insert(L.end(), A);
L.insert(L.end(), B);
// Save typing.
typedef simple_ilist<Node>::iterator iterator;
typedef simple_ilist<Node>::reverse_iterator reverse_iterator;
typedef simple_ilist<Node>::const_iterator const_iterator;
typedef simple_ilist<Node>::const_reverse_iterator const_reverse_iterator;
// Check conversion values.
EXPECT_EQ(L.begin(), iterator(L.rend()));
EXPECT_EQ(++L.begin(), iterator(++L.rbegin()));
EXPECT_EQ(L.end(), iterator(L.rbegin()));
EXPECT_EQ(L.rbegin(), reverse_iterator(L.end()));
EXPECT_EQ(++L.rbegin(), reverse_iterator(++L.begin()));
EXPECT_EQ(L.rend(), reverse_iterator(L.begin()));
// Check const iterator constructors.
EXPECT_EQ(CL.begin(), const_iterator(L.rend()));
EXPECT_EQ(CL.begin(), const_iterator(CL.rend()));
EXPECT_EQ(CL.rbegin(), const_reverse_iterator(L.end()));
EXPECT_EQ(CL.rbegin(), const_reverse_iterator(CL.end()));
// Confirm lack of implicit conversions.
static_assert(!std::is_convertible<iterator, reverse_iterator>::value,
"unexpected implicit conversion");
static_assert(!std::is_convertible<reverse_iterator, iterator>::value,
"unexpected implicit conversion");
static_assert(
!std::is_convertible<const_iterator, const_reverse_iterator>::value,
"unexpected implicit conversion");
static_assert(
!std::is_convertible<const_reverse_iterator, const_iterator>::value,
"unexpected implicit conversion");
}
} // end namespace
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