give StringMap a new ctor which allows you to initialize it

with an existing allocator.  The interesting use case of this
is that it allows "StringMap<whatever, BumpPtrAllocator&>" for
when you want to allocate out of a preexisting bump pointer
allocator owned by someone else.

llvm-svn: 109213

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/include/llvm/ADT/StringMap.h b/llvm/include/llvm/ADT/StringMap.h
index 482193859b6..59ff6aa4f6a 100644
--- a/llvm/include/llvm/ADT/StringMap.h
+++ b/llvm/include/llvm/ADT/StringMap.h
@@ -254,6 +254,10 @@ public:
   StringMap() : StringMapImpl(static_cast<unsigned>(sizeof(MapEntryTy))) {}
   explicit StringMap(unsigned InitialSize)
     : StringMapImpl(InitialSize, static_cast<unsigned>(sizeof(MapEntryTy))) {}
+  
+  explicit StringMap(AllocatorTy A)
+    : StringMapImpl(static_cast<unsigned>(sizeof(MapEntryTy))), Allocator(A) {}
+
   explicit StringMap(const StringMap &RHS)
     : StringMapImpl(static_cast<unsigned>(sizeof(MapEntryTy))) {
     assert(RHS.empty() &&