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Support backwards iteration starting from end().
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119871 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1235,7 +1235,7 @@ public:
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if (!branched()) {
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assert(rootOffset && "Cannot decrement begin()");
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--rootOffset;
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} else if (treeLeafOffset())
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} else if (valid() && treeLeafOffset())
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--treeLeafOffset();
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else
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treeDecrement();
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@ -352,6 +352,16 @@ TEST(IntervalMapTest, Branched) {
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EXPECT_FALSE(I.valid());
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EXPECT_TRUE(I == map.end());
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// Backwards iteration.
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for (unsigned i = 99; i; --i) {
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--I;
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ASSERT_TRUE(I.valid());
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EXPECT_EQ(10*i, I.start());
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EXPECT_EQ(10*i+5, I.stop());
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EXPECT_EQ(i, *I);
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}
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EXPECT_TRUE(I == map.begin());
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}
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} // namespace
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