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ADT: Add a drop_back() helper to ArrayRef

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The slice(N, M) interface is powerful but not concise when wanting to
drop a few elements off of an ArrayRef, fix this by adding a drop_back
method.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212370 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer 2014-07-05 06:12:30 +00:00
parent 22b4918557
commit 38dbb0292d
2 changed files with 13 additions and 0 deletions
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6
include/llvm/ADT/ArrayRef.h
View File

@ -147,6 +147,12 @@ namespace llvm {
return ArrayRef<T>(data()+N, M);
}
// \brief Drop the last \p N elements of the array.
ArrayRef<T> drop_back(unsigned N = 1) const {
assert(size() >= N && "Dropping more elements than exist");
return slice(0, size() - N);
}
/// @}
/// @name Operator Overloads
/// @{

7
unittests/ADT/ArrayRefTest.cpp
View File

@ -29,5 +29,12 @@ TEST(ArrayRefTest, AllocatorCopy) {
EXPECT_NE(Array2.data(), Array2c.data());
}
TEST(ArrayRefTest, DropBack) {
static const int TheNumbers[] = {4, 8, 15, 16, 23, 42};
ArrayRef<int> AR1(TheNumbers);
ArrayRef<int> AR2(TheNumbers, AR1.size() - 1);
EXPECT_TRUE(AR1.drop_back().equals(AR2));
}
} // end anonymous namespace