mirror of https://gitee.com/bigwinds/arangodb
77 lines
2.3 KiB
C++
77 lines
2.3 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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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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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_BASICS_STRING_REF_H
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#define ARANGODB_BASICS_STRING_REF_H 1
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#include "Basics/Common.h"
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#include "Basics/xxhash.h"
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namespace arangodb {
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/// @brief a struct describing a C character array
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/// not responsible for memory management!
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struct StringRef {
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StringRef() : data(""), length(0) {}
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explicit StringRef(std::string const& str) : data(str.c_str()), length(str.size()) {}
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explicit StringRef(char const* data) : data(data), length(strlen(data)) {}
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StringRef(char const* data, size_t length) : data(data), length(length) {}
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bool operator==(StringRef const& other) const {
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return (length == other.length && memcmp(data, other.data, length) == 0);
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}
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bool operator==(std::string const& other) const {
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return (length == other.size() && memcmp(data, other.c_str(), length) == 0);
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}
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char const* data;
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size_t length;
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};
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}
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namespace std {
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template <>
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struct hash<arangodb::StringRef> {
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size_t operator()(arangodb::StringRef const& value) const noexcept {
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return XXH64(value.data, value.length, 0xdeadbeef);
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}
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};
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template <>
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struct equal_to<arangodb::StringRef> {
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bool operator()(arangodb::StringRef const& lhs,
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arangodb::StringRef const& rhs) const {
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if (lhs.length != rhs.length) {
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return false;
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}
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return (memcmp(lhs.data, rhs.data, lhs.length) == 0);
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}
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};
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}
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#endif
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