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b29c2901de
a sequence of values.
It increments through the values in the half-open range: [Begin, End),
producing those values when indirecting the iterator. It should support
integers, iterators, and any other type providing these basic arithmetic
operations.
This came up in the C++ standards committee meeting, and it seemed like
a useful construct that LLVM might want as well, and I wanted to
understand how easily we could solve it. I suspect this can be used to
write simpler counting loops even in LLVM along the lines of:
for (int i : seq(0, v.size())) {
...
};
As part of this, I had to fix the lack of a proxy object returned from
the operator[] in our iterator facade.
Differential Revision: http://reviews.llvm.org/D17870
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@269390 91177308-0d34-0410-b5e6-96231b3b80d8
40 lines
980 B
C++
40 lines
980 B
C++
//===- SequenceTest.cpp - Unit tests for a sequence abstraciton -----------===//
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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/Sequence.h"
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#include "gtest/gtest.h"
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#include <list>
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using namespace llvm;
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namespace {
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TEST(SequenceTest, Basic) {
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int x = 0;
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for (int i : seq(0, 10))
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EXPECT_EQ(x++, i);
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EXPECT_EQ(10, x);
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auto my_seq = seq(0, 4);
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EXPECT_EQ(4, my_seq.end() - my_seq.begin());
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for (int i : {0, 1, 2, 3})
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EXPECT_EQ(i, (int)my_seq.begin()[i]);
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EXPECT_TRUE(my_seq.begin() < my_seq.end());
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auto adjusted_begin = my_seq.begin() + 2;
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auto adjusted_end = my_seq.end() - 2;
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EXPECT_TRUE(adjusted_begin == adjusted_end);
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EXPECT_EQ(2, *adjusted_begin);
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EXPECT_EQ(2, *adjusted_end);
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}
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} // anonymous namespace
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