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//=== llvm/unittest/ADT/BreadthFirstIteratorTest.cpp - BFS iterator 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/BreadthFirstIterator.h"
#include "TestGraph.h"
#include "gtest/gtest.h"
#include <array>
#include <iterator>
#include <type_traits>
#include <cstddef>
using namespace llvm;
namespace llvm {
TEST(BreadthFristIteratorTest, Basic) {
typedef bf_iterator<Graph<4>> BFIter;
Graph<4> G;
G.AddEdge(0, 1);
G.AddEdge(0, 2);
G.AddEdge(1, 3);
auto It = BFIter::begin(G);
auto End = BFIter::end(G);
EXPECT_EQ(It.getLevel(), 0U);
EXPECT_EQ(*It, G.AccessNode(0));
++It;
EXPECT_EQ(It.getLevel(), 1U);
EXPECT_EQ(*It, G.AccessNode(1));
++It;
EXPECT_EQ(It.getLevel(), 1U);
EXPECT_EQ(*It, G.AccessNode(2));
++It;
EXPECT_EQ(It.getLevel(), 2U);
EXPECT_EQ(*It, G.AccessNode(3));
++It;
EXPECT_EQ(It, End);
}
TEST(BreadthFristIteratorTest, Cycle) {
typedef bf_iterator<Graph<4>> BFIter;
Graph<4> G;
G.AddEdge(0, 1);
G.AddEdge(1, 0);
G.AddEdge(1, 2);
G.AddEdge(2, 1);
G.AddEdge(2, 1);
G.AddEdge(2, 3);
G.AddEdge(3, 2);
G.AddEdge(3, 1);
G.AddEdge(3, 0);
auto It = BFIter::begin(G);
auto End = BFIter::end(G);
EXPECT_EQ(It.getLevel(), 0U);
EXPECT_EQ(*It, G.AccessNode(0));
++It;
EXPECT_EQ(It.getLevel(), 1U);
EXPECT_EQ(*It, G.AccessNode(1));
++It;
EXPECT_EQ(It.getLevel(), 2U);
EXPECT_EQ(*It, G.AccessNode(2));
++It;
EXPECT_EQ(It.getLevel(), 3U);
EXPECT_EQ(*It, G.AccessNode(3));
++It;
EXPECT_EQ(It, End);
}
static_assert(
std::is_convertible_v<decltype(*std::declval<bf_iterator<Graph<3>>>()),
typename bf_iterator<Graph<3>>::reference>);
// bf_iterator should be (at-least) a forward-iterator
static_assert(std::is_base_of_v<std::forward_iterator_tag,
bf_iterator<Graph<4>>::iterator_category>);
TEST(BreadthFristIteratorTest, MultiPassSafeWithInternalSet) {
Graph<4> G;
G.AddEdge(0, 1);
G.AddEdge(1, 2);
G.AddEdge(1, 3);
std::array<decltype(G)::NodeType *, 4> NodesFirstPass, NodesSecondPass;
auto B = bf_begin(G), E = bf_end(G);
std::size_t I = 0;
for (auto It = B; It != E; ++It)
NodesFirstPass[I++] = *It;
I = 0;
for (auto It = B; It != E; ++It)
NodesSecondPass[I++] = *It;
EXPECT_EQ(NodesFirstPass, NodesSecondPass);
}
} // end namespace llvm
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