How to pack string in C++ msgpack?

Question

msgpack::object elem;
std::string tempString = "string";
elem["type"] = msgpack::pack(tempString);

Above code doesn't work

error: no matching function for call to 'pack(std::string&)'

How can I pack string into msgpack::object?

Answer 1

msgpack::pack() is a free function template in the namespace msgpack:

template <typename Stream, typename T>
inline void pack(Stream& s, const T& v);

The function obviously is stateless and needs a target where to pack the tempString to. The target can be any class that has the member funciton write(const char*, std::size_t);. For example, use std::stringstream:

std::string tempString = "string";
std::stringstream messagePacked;
msgpack::pack(messagePacked, tempString);

And you might want this:

msgpack::object elem;
std::string tempString = "string";
elem["type"] = tempString;
std::stringstream messagePacked;
msgpack::pack(messagePacked, elem);