foo.cpp

enum class YourKeys 
{
  A,
  B,
  Subtract
};

using keymap_t = std::unordered_map<std::string, YourKeys>;
const keymap_t g_theKeysDukeTheKeys = 
{
  { "A",      YourKeys::A      },
  { "B",      YourKeys::B      },
  { "Select", YourKeys::Select }
};

int32_t InputManager::findBindByString(const std::string &str)
{
  if(keymap_t::const_iterator itr = g_theKeysDukeTheKeys.find(str); itr != g_theKeysDukeTheKeys.cend())
  {
    return static_cast<int32_t>(itr->second);
  }
  return 0;
}