Example: typemeta_TTypeName

C++ example source code:

/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          https://www.mrpt.org/                         |
   |                                                                        |
   | Copyright (c) 2005-2025, Individual contributors, see AUTHORS file     |
   | See: https://www.mrpt.org/Authors - All rights reserved.               |
   | Released under BSD License. See: https://www.mrpt.org/License          |
   +------------------------------------------------------------------------+ */
#include <mrpt/typemeta/TTypeName.h>
#include <mrpt/typemeta/TTypeName_stl.h>

#include <iostream>
#include <memory>  // shared_ptr

// Declare custom user types:
struct MyFooClass
{
  using Ptr = std::shared_ptr<MyFooClass>;
};
namespace MyNS
{
struct MyBarClass
{
};
struct MyBarClass2
{
  DECLARE_TTYPENAME_CLASSNAME(MyNS::MyBarClass2)
};
}  // namespace MyNS
DECLARE_CUSTOM_TTYPENAME(MyFooClass);
DECLARE_CUSTOM_TTYPENAME(MyNS::MyBarClass);

void Test_TypeName()
{
  using namespace std;
  using namespace mrpt::typemeta;

  // Evaluation of type names as constexpr strings:
  constexpr auto s1 = TTypeName<int32_t>::get();
  cout << s1 << endl;

  cout << TTypeName<set<vector<double>>>::get() << endl;

  // Evaluation of user-defined types:
  cout << TTypeName<MyFooClass>::get() << endl;
  cout << TTypeName<MyFooClass::Ptr>::get() << endl;
  cout << TTypeName<MyNS::MyBarClass>::get() << endl;
  cout << TTypeName<MyNS::MyBarClass2>::get() << endl;

  // STL typenames as strings:
  cout << TTypeName<double>::get() << endl;
  cout << TTypeName<vector<double>>::get() << endl;
  cout << TTypeName<array<int32_t, 5>>::get() << endl;
  cout << TTypeName<set<double>>::get() << endl;
  cout << TTypeName<pair<int32_t, pair<int32_t, int32_t>>>::get() << endl;
  cout << TTypeName<map<double, set<int32_t>>>::get() << endl;
  cout << TTypeName<set<multimap<double, pair<MyFooClass, MyNS::MyBarClass2>>>>::get() << endl;
}

int main(int argc, char** argv)
{
  try
  {
    Test_TypeName();
    return 0;
  }
  catch (const std::exception& e)
  {
    std::cerr << "MRPT error: " << e.what() << std::endl;
    return -1;
  }
}