[英]Store a STL map into a Boost ConstBufferSequence
I'm trying to store a std::map<enum, int>
in a boost::beast::multi_buffer
. 我正在尝试将std::map<enum, int>
在boost::beast::multi_buffer
。 So far I've been using boost::asio::buffer_copy
and boost::asio::buffer
to store vectors and PODs. 到目前为止,我一直在使用boost::asio::buffer_copy
和boost::asio::buffer
来存储矢量和POD。 However, I couldn't find a way to store a STL map. 但是,我找不到存储STL映射的方法。
I've tried this: 我已经试过了:
auto t_map = std::map<CODES, int>(); // CODES is an enum type
auto t_map_size = t_map.size() * sizeof(std::pair<CODES, int>);
auto tmp_buffer = boost::asio::buffer(t_map, t_map_size); // this is not supported
auto size = boost::asio::buffer_copy(t_map_size , tmp_buffer);
boost::beast::multi_buffer buffer;
buffer.commit(size);
std::map<enum, int>
in a ConstBufferSequence
? 有什么方法可以在ConstBufferSequence
存储std::map<enum, int>
吗? (because the boost::asio::buffer_copy
needs one) (因为boost::asio::buffer_copy
需要一个) std::map<enum, int>
in a boost::beast::multi_buffer
? 如果没有,是否有任何变通办法将std::map<enum, int>
在boost::beast::multi_buffer
? Thanks! 谢谢!
You can convert your map into vector of POD, as POD choose type which can store enum + int, for example int64_t
: 您可以将地图转换为POD的向量,因为POD选择可以存储enum + int的类型,例如int64_t
:
So create vector, scan your map creating items of vector using some bitwise operations and data is ready: 因此,创建矢量,使用一些按位操作扫描您的地图以创建矢量项目,并且数据已准备就绪:
auto t_map = std::map<CODES, int>(); // CODES is an enum type
std::vector<int64_t> vec;
for (auto&& elemMap : t_map)
{
int64_t val = elemMap.first; // store key
val <<= 32; // shift key
val |= elemMap.second; // store value
vec.push_back (val);
}
auto tmp_buffer = boost::asio::buffer(vec); // this is supported
Unpack vector into map should be easy. 将向量解压缩到地图中应该很容易。
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