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/*
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*
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* Copyright 2015, Google Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef GRPCXX_SUPPORT_STRING_REF_H
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#define GRPCXX_SUPPORT_STRING_REF_H
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#include <iterator>
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#include <iosfwd>
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#include <grpc++/support/config.h>
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namespace grpc {
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/// This class is a non owning reference to a string.
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///
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/// It should be a strict subset of the upcoming std::string_ref.
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///
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/// \see http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3442.html
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///
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/// The constexpr is dropped or replaced with const for legacy compiler
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/// compatibility.
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class string_ref {
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public:
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// types
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typedef const char* const_iterator;
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typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
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// constants
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const static size_t npos;
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// construct/copy.
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string_ref() : data_(nullptr), length_(0) {}
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string_ref(const string_ref& other)
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: data_(other.data_), length_(other.length_) {}
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string_ref& operator=(const string_ref& rhs);
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string_ref(const char* s);
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string_ref(const char* s, size_t l) : data_(s), length_(l) {}
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string_ref(const grpc::string& s) : data_(s.data()), length_(s.length()) {}
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// iterators
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const_iterator begin() const { return data_; }
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const_iterator end() const { return data_ + length_; }
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const_iterator cbegin() const { return data_; }
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const_iterator cend() const { return data_ + length_; }
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const_reverse_iterator rbegin() const {
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return const_reverse_iterator(end());
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}
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const_reverse_iterator rend() const {
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return const_reverse_iterator(begin());
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}
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const_reverse_iterator crbegin() const {
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return const_reverse_iterator(end());
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}
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const_reverse_iterator crend() const {
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return const_reverse_iterator(begin());
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}
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// capacity
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size_t size() const { return length_; }
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size_t length() const { return length_; }
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size_t max_size() const { return length_; }
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bool empty() const { return length_ == 0; }
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// element access
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const char* data() const { return data_; }
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// string operations
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int compare(string_ref x) const;
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bool starts_with(string_ref x) const;
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bool ends_with(string_ref x) const;
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size_t find(string_ref s) const;
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size_t find(char c) const;
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string_ref substr(size_t pos, size_t n = npos) const;
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private:
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const char* data_;
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size_t length_;
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};
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// Comparison operators
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bool operator==(string_ref x, string_ref y);
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bool operator!=(string_ref x, string_ref y);
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bool operator<(string_ref x, string_ref y);
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bool operator>(string_ref x, string_ref y);
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bool operator<=(string_ref x, string_ref y);
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bool operator>=(string_ref x, string_ref y);
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std::ostream& operator<<(std::ostream& stream, const string_ref& string);
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} // namespace grpc
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#endif // GRPCXX_SUPPORT_STRING_REF_H
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