1 files changed, 51 insertions, 0 deletions
diff --git a/src/string_piece.h b/src/string_piece.h
new file mode 100644
index 0000000..0e55afb
--- /dev/null
+++ b/src/string_piece.h
@@ -0,0 +1,51 @@
+// Copyright 2011 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef NINJA_STRINGPIECE_H_
+#define NINJA_STRINGPIECE_H_
+
+#include <string>
+
+using namespace std;
+
+#include <string.h>
+
+/// StringPiece represents a slice of a string whose memory is managed
+/// externally.  It is useful for reducing the number of std::strings
+/// we need to allocate.
+struct StringPiece {
+  StringPiece() : str_(NULL), len_(0) {}
+
+  /// The constructors intentionally allow for implicit conversions.
+  StringPiece(const string& str) : str_(str.data()), len_(str.size()) {}
+  StringPiece(const char* str) : str_(str), len_(strlen(str)) {}
+
+  bool operator==(const StringPiece& other) const {
+    return len_ == other.len_ && memcmp(str_, other.str_, len_) == 0;
+  }
+  bool operator!=(const StringPiece& other) const {
+    return !(*this == other);
+  }
+
+  /// Convert the slice into a full-fledged std::string, copying the
+  /// data into a new string.
+  string AsString() const {
+    return string(str_, len_);
+  }
+
+  const char* str_;
+  int len_;
+};
+
+#endif  // NINJA_BROWSE_H_