compile failed

[sequoiar]

the failure message is like below

command_interface.hpp:153:35: error: 'x6' was not declared in this scope
       return err_type_args(typeid(x##n).name(), n); \
                                   ^
/opt/include/boost/preprocessor/repetition/limits/repeat_256.hpp:282:62: note: in expansion of macro 'CAST'
 # define BOOST_PP_REPEAT_2_7(m, d) BOOST_PP_REPEAT_2_6(m, d) m(3, 6,

[chrisaycock]

Could you show me the type signature of the function/command you registered?

[sequoiar]

check below cmd signature
std::string cmd_say(std::string msg);

[chrisaycock]

I am unable to reproduce the error.

#include <iostream>
#include "command_interface.hpp"

class SampleInterface : public CommandInterface {
  std::string cmd_say(std::string msg) {
    return "Received: " + msg;
  }

  void register_commands() override {
    register_command(&SampleInterface::cmd_say, "say", "Repeat a string");
  }
};

int main() {
  SampleInterface si;
  std::string text;
  std::cout << ">>> ";
  while (std::getline(std::cin, text)) {
    std::cout << si.eval(text) << std::endl << std::endl;
    std::cout << ">>> ";
  }
  return 0;
}

It compiles and runs.

>>> help
say   Repeat a string
help  Show this help

>>> say SomeText 
Received: SomeText

Are you able to show your entire code? Specifically, are you able to provide a minimal reproducible example?

Also, which compiler are you using? Which versions of C++ and Boost?

[sequoiar]

cli.h :

#include <sstream>
#include <string>
#include "command_interface.hpp"

class cli: public CommandInterface
{
    public:
        std::string cmd_say(std::string msg);

        /// @brief overrid command-interface
        virtual void register_commands();

};

cli.cpp:

#include <sstream>
#include <iostream>
#include "cli.h"

using namespace std;

std::string cli::cmd_say(std::string msg) {
    std::ostringstream ss;
    ss << "Hi Sir, This is " << msg << std::endl;
    return ss.str();
}

/// @brief register commands
void cli::register_commands()
{
    register_command(&cli::cmd_say,        "say",        "Say hello words");
}

int main(int argc, char *argv[]) {
    auto cmdline = cli{};

    std::string text;
        cout << "<<< ";
        while (getline(cin, text))
        {
            cout << cmdline.eval(text) << endl;
            cout <<"<<< ";
        }

        return 0;
}

compile with c++11 and boost-1.77.0

g++ -std=c++11 -I/opt/include/ -I../src/command-interface/ cli.cpp -o cli.cxxbin

compile error:

nsion of macro 'BOOST_PP_REPEAT'
 BOOST_PP_REPEAT(8, CALL_COMMAND, ~)
 ^~~~~~~~~~~~~~~
../src/command-interface/command_interface.hpp:172:89: error: 'x6' was not declared in this scope
     return boost::lexical_cast<std::string>((obj->*func)( BOOST_PP_REPEAT(n, REP_COMMA, x) )); \
                                                                                         ^
../src/command-interface/command_interface.hpp:144:52: note: in definition of macro 'REP_COMMA'
 #define REP_COMMA(z, n, text) BOOST_PP_COMMA_IF(n) text##n

[chrisaycock]

Ah, the issue was C++11. I have pushed a fix that now compiles your code under C++11.

$ c++ -std=c++11 cli.cpp 
$ ./a.out 
<<< say GitHub
Hi Sir, This is GitHub