err_util.hpp

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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#ifndef CMR_ERRUTIL_HPP
#define CMR_ERRUTIL_HPP

#include <stdexcept>
#include <string>
#include <iostream>

#define CMR_CATCH_PRINT_THROW( msg, new_ex )  catch(const std::exception &e)  \
  { std::cerr << e.what() << " " << msg << ".\n"; throw new_ex; }


namespace CMR {
namespace util {

template <typename act_type>
class ScopeGuard {
public:

    ScopeGuard(act_type action) :
        final_action(std::move(action)), active(true) {}


    ~ScopeGuard()
        { if(active) final_action(); } 

    void dismiss()
        { active = false; } 

    ScopeGuard() = delete; 
    ScopeGuard(const ScopeGuard&) = delete; 
    ScopeGuard& operator=(const ScopeGuard&) = delete; 

    ScopeGuard(ScopeGuard&& rhs) :
        final_action(std::move(rhs.final_action)),
        active(rhs.active) {rhs.dismiss(); }

private:
    act_type final_action; 
    bool active; 
};

template <typename act_type>
ScopeGuard<act_type> make_guard(act_type f)
{
  return ScopeGuard<act_type>(std::move(f));
}


struct retcode_error : public std::runtime_error {
    retcode_error(const int rval, const std::string &func_name) :
        std::runtime_error(func_name + " failed with rval " +
                           std::to_string(rval)) {}
};

}
}


#endif