added base/strutil.h file

base/strutil.h

@@ -0,0 +1,49 @@
+// Copyright 2010 Google
+// 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.
+
+// A string-like object that points to a sized piece of memory.
+//
+// Functions or methods may use const StringPiece& parameters to accept either
+// a "const char*" or a "string" value that will be implicitly converted to
+// a StringPiece.  The implicit conversion means that it is often appropriate
+// to include this .h file in other files rather than forward-declaring
+// StringPiece as would be appropriate for most other Google classes.
+//
+// Systematic usage of StringPiece is encouraged as it will reduce unnecessary
+// conversions from "const char*" to "string" and back again.
+
+#ifndef BASE_STRUTIL_H
+#define BASE_STRUTIL_H
+
+#include "base/stringpiece.h"
+
+namespace operations_research {
+// ----------------------------------------------------------------------
+// HasSuffixString()
+//    Return true if str ends in suffix.
+// StripSuffixString()
+//    Given a string and a putative suffix, returns the string minus the
+//    suffix string if the suffix matches, otherwise the original
+//    string.
+// TryStripSuffixString()
+//    Like StripSuffixString, but return true if the suffix was
+//    successfully matched.  Write the output to *result.
+//    It is safe for result to point back to the input string.
+// ----------------------------------------------------------------------
+
+inline bool HasSuffixString(const StringPiece& str,
+                            const StringPiece& suffix) {
+  return str.ends_with(suffix);
+}
+}  // namespace operations_research
+#endif  // BASE_STRUTIL_H