| /* |
| * |
| * Copyright 2015 gRPC authors. |
| * |
| * 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 GRPCPP_IMPL_CODEGEN_STRING_REF_H |
| #define GRPCPP_IMPL_CODEGEN_STRING_REF_H |
| |
| #include <string.h> |
| |
| #include <algorithm> |
| #include <iosfwd> |
| #include <iostream> |
| #include <iterator> |
| |
| #include <grpcpp/impl/codegen/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 |
| /// |
| /// The constexpr is dropped or replaced with const for legacy compiler |
| /// compatibility. |
| class string_ref { |
| public: |
| /// types |
| typedef const char* const_iterator; |
| typedef std::reverse_iterator<const_iterator> const_reverse_iterator; |
| |
| /// constants |
| const static size_t npos; |
| |
| /// construct/copy. |
| string_ref() : data_(nullptr), length_(0) {} |
| string_ref(const string_ref& other) |
| : data_(other.data_), length_(other.length_) {} |
| string_ref& operator=(const string_ref& rhs) { |
| data_ = rhs.data_; |
| length_ = rhs.length_; |
| return *this; |
| } |
| |
| string_ref(const char* s) : data_(s), length_(strlen(s)) {} |
| 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 |
| const_iterator begin() const { return data_; } |
| const_iterator end() const { return data_ + length_; } |
| const_iterator cbegin() const { return data_; } |
| 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 |
| size_t size() const { return length_; } |
| size_t length() const { return length_; } |
| size_t max_size() const { return length_; } |
| bool empty() const { return length_ == 0; } |
| |
| /// element access |
| const char* data() const { return data_; } |
| |
| /// string operations |
| int compare(string_ref x) const { |
| size_t min_size = length_ < x.length_ ? length_ : x.length_; |
| int r = memcmp(data_, x.data_, min_size); |
| if (r < 0) return -1; |
| if (r > 0) return 1; |
| if (length_ < x.length_) return -1; |
| if (length_ > x.length_) return 1; |
| return 0; |
| } |
| |
| bool starts_with(string_ref x) const { |
| return length_ >= x.length_ && (memcmp(data_, x.data_, x.length_) == 0); |
| } |
| |
| bool ends_with(string_ref x) const { |
| return length_ >= x.length_ && |
| (memcmp(data_ + (length_ - x.length_), x.data_, x.length_) == 0); |
| } |
| |
| size_t find(string_ref s) const { |
| auto it = std::search(cbegin(), cend(), s.cbegin(), s.cend()); |
| return it == cend() ? npos : std::distance(cbegin(), it); |
| } |
| |
| size_t find(char c) const { |
| auto it = std::find(cbegin(), cend(), c); |
| return it == cend() ? npos : std::distance(cbegin(), it); |
| } |
| |
| string_ref substr(size_t pos, size_t n = npos) const { |
| if (pos > length_) pos = length_; |
| if (n > (length_ - pos)) n = length_ - pos; |
| return string_ref(data_ + pos, n); |
| } |
| |
| private: |
| const char* data_; |
| size_t length_; |
| }; |
| |
| /// Comparison operators |
| inline bool operator==(string_ref x, string_ref y) { return x.compare(y) == 0; } |
| inline bool operator!=(string_ref x, string_ref y) { return x.compare(y) != 0; } |
| inline bool operator<(string_ref x, string_ref y) { return x.compare(y) < 0; } |
| inline bool operator<=(string_ref x, string_ref y) { return x.compare(y) <= 0; } |
| inline bool operator>(string_ref x, string_ref y) { return x.compare(y) > 0; } |
| inline bool operator>=(string_ref x, string_ref y) { return x.compare(y) >= 0; } |
| |
| inline std::ostream& operator<<(std::ostream& out, const string_ref& string) { |
| return out << grpc::string(string.begin(), string.end()); |
| } |
| |
| } // namespace grpc |
| |
| #endif // GRPCPP_IMPL_CODEGEN_STRING_REF_H |