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223ce5e130
The single-element ilist::splice() function supports a noop move: List.splice(I, List, I); The corresponding std::list function doesn't allow that, so add a unit test to document that behavior. This also means that List.splice(I, List, F); is somewhat surprisingly not equivalent to List.splice(I, List, F, next(F)); This patch adds an assertion to catch the illegal case I == F above. Alternatively, we could make I == F a legal noop, but that would make ilist differ even more from std::list. llvm-svn: 170443
66 lines
1.7 KiB
C++
66 lines
1.7 KiB
C++
//===- llvm/unittest/ADT/APInt.cpp - APInt unit tests ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/ilist.h"
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#include "llvm/ADT/ilist_node.h"
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#include "llvm/ADT/STLExtras.h"
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#include "gtest/gtest.h"
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#include <ostream>
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using namespace llvm;
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namespace {
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struct Node : ilist_node<Node> {
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int Value;
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Node() {}
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Node(int _Value) : Value(_Value) {}
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};
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TEST(ilistTest, Basic) {
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ilist<Node> List;
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List.push_back(Node(1));
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EXPECT_EQ(1, List.back().Value);
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EXPECT_EQ(0, List.back().getPrevNode());
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EXPECT_EQ(0, List.back().getNextNode());
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List.push_back(Node(2));
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EXPECT_EQ(2, List.back().Value);
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EXPECT_EQ(2, List.front().getNextNode()->Value);
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EXPECT_EQ(1, List.back().getPrevNode()->Value);
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const ilist<Node> &ConstList = List;
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EXPECT_EQ(2, ConstList.back().Value);
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EXPECT_EQ(2, ConstList.front().getNextNode()->Value);
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EXPECT_EQ(1, ConstList.back().getPrevNode()->Value);
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}
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TEST(ilistTest, SpliceOne) {
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ilist<Node> List;
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List.push_back(1);
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// The single-element splice operation supports noops.
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List.splice(List.begin(), List, List.begin());
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EXPECT_EQ(1u, List.size());
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EXPECT_EQ(1, List.front().Value);
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EXPECT_TRUE(llvm::next(List.begin()) == List.end());
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// Altenative noop. Move the first element behind itself.
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List.push_back(2);
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List.push_back(3);
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List.splice(llvm::next(List.begin()), List, List.begin());
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EXPECT_EQ(3u, List.size());
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EXPECT_EQ(1, List.front().Value);
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EXPECT_EQ(2, llvm::next(List.begin())->Value);
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EXPECT_EQ(3, List.back().Value);
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}
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}
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