| // 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 { |
| typedef const char* const_iterator; |
| |
| 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)) {} |
| |
| StringPiece(const char* str, size_t len) : str_(str), len_(len) {} |
| |
| 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 len_ ? string(str_, len_) : string(); |
| } |
| |
| const_iterator begin() const { |
| return str_; |
| } |
| |
| const_iterator end() const { |
| return str_ + len_; |
| } |
| |
| char operator[](size_t pos) const { |
| return str_[pos]; |
| } |
| |
| size_t size() const { |
| return len_; |
| } |
| |
| const char* str_; |
| size_t len_; |
| }; |
| |
| #endif // NINJA_STRINGPIECE_H_ |