66 lines
2 KiB
C++
66 lines
2 KiB
C++
/*
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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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