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Allow ArrayRefViews to opt in to a getOriginalArray() accessor.

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John McCall
2017-07-07 02:33:37 -04:00
parent 0efcc0860e
commit dbfc48218f
1 changed files with 11 additions and 2 deletions
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13
include/swift/Basic/ArrayRefView.h
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@@ -24,14 +24,15 @@ namespace swift {
/// An adapter for iterating over a range of values as a range of
/// values of a different type.
template <class Orig, class Projected, Projected (&Project)(const Orig &)>
template <class Orig, class Projected, Projected (&Project)(const Orig &),
bool AllowOrigAccess = false>
class ArrayRefView {
llvm::ArrayRef<Orig> Array;
public:
ArrayRefView(llvm::ArrayRef<Orig> array) : Array(array) {}
class iterator {
friend class ArrayRefView<Orig,Projected,Project>;
friend class ArrayRefView<Orig,Projected,Project,AllowOrigAccess>;
const Orig *Ptr;
iterator(const Orig *ptr) : Ptr(ptr) {}
public:
@@ -98,6 +99,14 @@ public:
ArrayRefView slice(unsigned start, unsigned length) const {
return ArrayRefView(Array.slice(start, length));
}
/// Peek through to the underlying array. This operation is not
/// supported by default; it must be enabled at specialization time.
llvm::ArrayRef<Orig> getOriginalArray() const {
static_assert(AllowOrigAccess,
"original array access not enabled for this view");
return Array;
}
};
} // end namespace swift