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add ::drop_back() and ::drop_front() methods, which are like pop_front/pop_back on a vector, but a) aren't destructive to "this", and b) can take a # elements to drop.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148791 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2012-01-24 08:58:57 +00:00
parent df39028607
commit a97a5eabe2
1 changed files with 14 additions and 0 deletions
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14
include/llvm/ADT/StringRef.h
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@ -353,6 +353,20 @@ namespace llvm {
Start = min(Start, Length);
return StringRef(Data + Start, min(N, Length - Start));
}
/// drop_front - Return a StringRef equal to 'this' but with the first
/// elements dropped.
StringRef drop_front(unsigned N = 1) const {
assert(size() >= N && "Dropping more elements than exist");
return substr(N);
}
/// drop_back - Return a StringRef equal to 'this' but with the last
/// elements dropped.
StringRef drop_back(unsigned N = 1) const {
assert(size() >= N && "Dropping more elements than exist");
return substr(0, size()-N);
}
/// slice - Return a reference to the substring from [Start, End).
///