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66 lines
2.0 KiB
66 lines
2.0 KiB
/* |
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* Copyright (C) 2017 The Android Open Source Project |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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#ifndef LIBTEXTCLASSIFIER_UTIL_STRINGS_STRINGPIECE_H_ |
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#define LIBTEXTCLASSIFIER_UTIL_STRINGS_STRINGPIECE_H_ |
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#include <stddef.h> |
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#include <string> |
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namespace libtextclassifier { |
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// Read-only "view" of a piece of data. Does not own the underlying data. |
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class StringPiece { |
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public: |
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StringPiece() : StringPiece(nullptr, 0) {} |
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StringPiece(const char *str) // NOLINT(runtime/explicit) |
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: start_(str), size_(strlen(str)) {} |
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StringPiece(const char *start, size_t size) |
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: start_(start), size_(size) {} |
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// Intentionally no "explicit" keyword: in function calls, we want strings to |
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// be converted to StringPiece implicitly. |
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StringPiece(const std::string &s) // NOLINT(runtime/explicit) |
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: StringPiece(s.data(), s.size()) {} |
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StringPiece(const std::string &s, int offset, int len) |
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: StringPiece(s.data() + offset, len) {} |
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char operator[](size_t i) const { return start_[i]; } |
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// Returns start address of underlying data. |
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const char *data() const { return start_; } |
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// Returns number of bytes of underlying data. |
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size_t size() const { return size_; } |
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size_t length() const { return size_; } |
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// Returns a std::string containing a copy of the underlying data. |
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std::string ToString() const { |
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return std::string(data(), size()); |
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} |
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private: |
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const char *start_; // Not owned. |
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size_t size_; |
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}; |
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} // namespace libtextclassifier |
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#endif // LIBTEXTCLASSIFIER_UTIL_STRINGS_STRINGPIECE_H_
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