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add some slice helper methods.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126878 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2011-03-02 20:55:51 +00:00
parent 291bb70d93
commit fa09685a9a
1 changed files with 13 additions and 2 deletions
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15
include/llvm/ADT/ArrayRef.h
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@ -96,10 +96,22 @@ namespace llvm {
return Data[Length-1];
}
/// slice(n) - Chop off the first N elements of the array.
ArrayRef<T> slice(unsigned N) {
assert(N <= size() && "Invalid specifier");
return ArrayRef<T>(data()+N, size()-N);
}
/// slice(n, m) - Chop off the first N elements of the array, and keep M
/// elements in the array.
ArrayRef<T> slice(unsigned N, unsigned M) {
assert(N+M <= size() && "Invalid specifier");
return ArrayRef<T>(data()+N, M);
}
/// @}
/// @name Operator Overloads
/// @{
const T &operator[](size_t Index) const {
assert(Index < Length && "Invalid index!");
return Data[Index];
@ -108,7 +120,6 @@ namespace llvm {
/// @}
/// @name Expensive Operations
/// @{
std::vector<T> vec() const {
return std::vector<T>(Data, Data+Length);
}