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/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef GRPCXX_STRING_REF_H
#define GRPCXX_STRING_REF_H
#include <iterator>
#include <grpc++/support/config.h>
namespace grpc {
// This class is a non owning reference to a string.
// It should be a strict subset of the upcoming std::string_ref. See:
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3442.html
class string_ref {
public:
// types
typedef const char* const_iterator;
typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
// constants
static constexpr size_t npos = size_t(-1);
// construct/copy.
constexpr string_ref() : data_(nullptr), length_(0) {}
constexpr string_ref(const string_ref& other)
: data_(other.data_), length_(other.length_) {}
string_ref& operator=(const string_ref& rhs);
string_ref(const char* s);
constexpr string_ref(const char* s, size_t l) : data_(s), length_(l) {}
string_ref(const grpc::string& s) : data_(s.data()), length_(s.length()) {}
// iterators
constexpr const_iterator begin() const { return data_; }
constexpr const_iterator end() const { return data_ + length_; }
constexpr const_iterator cbegin() const { return data_; }
constexpr const_iterator cend() const { return data_ + length_; }
const_reverse_iterator rbegin() const {
return const_reverse_iterator(end());
}
const_reverse_iterator rend() const {
return const_reverse_iterator(begin());
}
const_reverse_iterator crbegin() const {
return const_reverse_iterator(end());
}
const_reverse_iterator crend() const {
return const_reverse_iterator(begin());
}
// capacity
constexpr size_t size() const { return length_; }
constexpr size_t length() const { return length_; }
constexpr size_t max_size() const { return length_; }
constexpr bool empty() const { return length_ == 0; }
// element access
const char* data() const { return data_; }
// string operations
int compare(string_ref x) const;
bool starts_with(string_ref x) const;
bool ends_with(string_ref x) const;
size_t find(string_ref s) const;
size_t find(char c) const;
// Defined as constexpr in n3442 but C++11 constexpr semantics do not allow
// the implementation of this function to comply.
/* constrexpr */ string_ref substr(size_t pos, size_t n = npos) const;
private:
const char* data_;
size_t length_;
};
// Comparison operators
bool operator==(string_ref x, string_ref y);
bool operator!=(string_ref x, string_ref y);
bool operator<(string_ref x, string_ref y);
bool operator>(string_ref x, string_ref y);
bool operator<=(string_ref x, string_ref y);
bool operator>=(string_ref x, string_ref y);
} // namespace grpc
#endif // GRPCXX_STRING_REF_H
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