how to get msgpack type dynamically ? (say, stringified or via typeid)

[timotheecour]

(originally asked here: https://github.com/rpclib/rpclib/issues/113)

[redboltz]

As @sztomi mentioned at the original question, type member variable is the way to get type.

See https://github.com/msgpack/msgpack-c/wiki/v2_0_cpp_object

[redboltz]

It might be helpful: https://github.com/msgpack/msgpack-c/issues/462#issuecomment-216420435

[timotheecour]

could we have a toString(msgpack::type) method/function added? that would help with debugging

[timotheecour]

@redboltz Actually, could you please provide an example of how to get type? I'm using rpclib.

rpc::client c(...);
auto temp = c.call("function", "bar");
auto t=temp.type;
class clmdep_msgpack::v1::object_handle' has no member named 'type'

[redboltz]

It seems that t is an msgpack::object handle not msgpack::object.

Try this:

auto t=temp.get().type

[timotheecour]

ah ya sorry just saw that at the same time... to summarize remaining point:a msgpack::type::toString() method/function would help.

[sztomi]

BTW, @timotheecour I gave that same example on the other issue you opened and an additional one for composite types.

[timotheecour]

@sztomi thanks; however now I'm running into an issue wtih msgpack::type caused by having to include msgpack.hpp (it worked so long i only had to access rpclib but not when i need type)

foo.cpp:

#include <msgpack.hpp>

rpc::client c(...);
auto temp = c.call("function", "bar");
auto temp1=temp.get().type;
switch (temp1) {
 case msgpack::type::NIL:
 ...
}

In file included from 
include/msgpack/adaptor/carray.hpp:13:0,
                 from include/msgpack/type.hpp:4,
                 from include/msgpack.hpp:18,
                 from foo.cpp:12:
include/msgpack/v1/adaptor/carray.hpp:27:8: error: 'convert' is not a class template
 struct convert<T[N]> {
        ^
include/msgpack/v1/adaptor/carray.hpp:28:14: error: 'object' in namespace 'msgpack' does not name a type
     msgpack::object const& operator()(msgpack::object const& o, T* v) const {

I installed rpclib via:

cmake_minimum_required(VERSION 2.8.3)
project(rpclib)
find_package(catkin REQUIRED)
find_package(catkin_simple REQUIRED)
catkin_simple()

include(ExternalProject)
file(MAKE_DIRECTORY ${CATKIN_DEVEL_PREFIX}/include)

ExternalProject_Add(${PROJECT_NAME}-upstream
  PREFIX upstream
  GIT_REPOSITORY https://github.com/rpclib/rpclib.git
  GIT_TAG v1.0.0
  INSTALL_DIR ${CATKIN_DEVEL_PREFIX}
  BUILD_IN_SOURCE 1
  CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${CATKIN_DEVEL_PREFIX} -DCMAKE_CXX_FLAGS=-fPIC 
  UPDATE_COMMAND "" # avoid unnecessary recompiles
)

catkin_package(
  CFG_EXTRAS ${PROJECT_NAME}-extras.cmake.em
  LIBRARIES rpc
)

${PROJECT_NAME}-extras.cmake.em:

add_definitions(-DRPCLIB_MSGPACK=clmdep_msgpack)

Addding set(MSGPACK_CXX11 ON CACHE BOOL "Turn on C++11 for msgpack") didn't help

[sztomi]

@timotheecour This sounds like a different issue and probably not msgpack-related. Could you open a new ticket on the rpclib repo? I can see already that you are not using the latest release, so first of all please test with the v2.0.1 tag.