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https://github.com/Telecominfraproject/wlan-cloud-lib-cppkafka.git
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107 lines
3.2 KiB
C++
107 lines
3.2 KiB
C++
/*
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* Copyright (c) 2016, Matias Fontanini
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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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*
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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 CPPKAFKA_BUFFER_H
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#define CPPKAFKA_BUFFER_H
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#include <cstddef>
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#include <algorithm>
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namespace cppkafka {
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/**
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* \brief Represents a view of a buffer.
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*
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* This is only a view, hence you should convert the contents of a buffer into
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* some other container if you want to store it somewhere.
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*
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* If you're using this to produce a message, you *need* to guarantee that the
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* pointer that this buffer points to will still until the call to Producer::produce
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* returns.
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*/
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class Buffer {
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public:
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using DataType = unsigned char;
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/**
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* Constructs an empty buffer
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*/
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Buffer();
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/**
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* Constructs a buffer from a pointer and a size
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*
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* \param data A pointer to some type of size 1
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* \param size The size of the buffer
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*/
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template <typename T>
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Buffer(const T* data, size_t size)
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: data_(reinterpret_cast<const DataType*>(data)), size_(size) {
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static_assert(sizeof(T) == 1, "Buffer must point to elements of 1 byte");
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}
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/**
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* \brief Construct a buffer from a const string ref
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*
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* Note that you *can't use temporaries* here as they would be destructed after
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* the constructor finishes.
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*/
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Buffer(const std::string& data);
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// Don't allow construction from temporaries
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Buffer(std::string&&) = delete;
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Buffer(const Buffer&) = delete;
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Buffer(Buffer&&) = default;
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Buffer& operator=(const Buffer&) = delete;
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Buffer& operator=(Buffer&&) = default;
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/**
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* Getter for the data pointer
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*/
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const DataType* get_data() const;
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/**
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* Getter for the size of the buffer
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*/
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size_t get_size() const;
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/**
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* Converts the contents of the buffer into a string
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*/
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std::string as_string() const;
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private:
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const DataType* data_;
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size_t size_;
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};
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} // cppkafka
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#endif // CPPKAFKA_BUFFER_H
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