Add thin layer over StringMap to form StringSet. By Mikhail Glushenkov.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51048 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/ADT/StringSet.h

@@ -0,0 +1,40 @@
+//===--- StringSet.h - The LLVM Compiler Driver -----------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open
+// Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  StringSet - A set-like wrapper for the StringMap.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ADT_STRINGSET_H
+#define LLVM_ADT_STRINGSET_H
+
+#include "llvm/ADT/StringMap.h"
+
+#include <cassert>
+
+namespace llvm {
+
+  /// StringSet - A wrapper for StringMap that provides set-like
+  /// functionality.  Only insert() and count() methods are used by my
+  /// code.
+  template <class AllocatorTy = llvm::MallocAllocator>
+  class StringSet : public llvm::StringMap<char, AllocatorTy> {
+    typedef llvm::StringMap<char, AllocatorTy> base;
+  public:
+    void insert (const std::string& InLang) {
+      assert(!InLang.empty());
+      const char* KeyStart = &InLang[0];
+      const char* KeyEnd = KeyStart + InLang.size();
+      base::insert(llvm::StringMapEntry<char>::
+                   Create(KeyStart, KeyEnd, base::getAllocator(), '+'));
+    }
+  };
+}
+
+#endif // LLVM_ADT_STRINGSET_H