Header.h

#pragma once
 
#include <kafka/Project.h>
 
#include <kafka/Types.h>
 
#include <algorithm>
#include <string>
#include <vector>
 
 
namespace KAFKA_API {
 
struct Header
{
    using Key   = std::string;
    using Value = ConstBuffer;
 
    Header() = default;
    Header(Key k, Value v): key(std::move(k)), value(v) {}
 
    std::string toString() const
    {
        return (key.empty() ? "[null]" : key) + ":" + value.toString();
    }
 
    Key   key;
    Value value;
};
 
using Headers = std::vector<Header>;
 
#if COMPILER_SUPPORTS_CPP_17
const inline Headers NullHeaders = Headers{};
#else
const static Headers NullHeaders = Headers{};
#endif
 
inline std::string toString(const Headers& headers)
{
    std::string ret;
    std::for_each(headers.cbegin(), headers.cend(),
                  [&ret](const auto& header) {
                      ret.append(ret.empty() ? "" : ",").append(header.toString());
                  });
    return ret;
}
 
} // end of KAFKA_API