simutil.h

//==========================================================================
//  SIMUTIL.H - part of
//                     OMNeT++/OMNEST
//            Discrete System Simulation in C++
//
//==========================================================================
 
/*--------------------------------------------------------------*
  Copyright (C) 1992-2017 Andras Varga
  Copyright (C) 2006-2017 OpenSim Ltd.
 
  This file is distributed WITHOUT ANY WARRANTY. See the file
  `license' for details on this and other legal matters.
*--------------------------------------------------------------*/
 
#ifndef __OMNETPP_SIMUTIL_H
#define __OMNETPP_SIMUTIL_H
 
#include <cmath>
#include <string>    // for std::string
#include <typeinfo>  // for type_info
#include <type_traits> // is_integer
#include "simkerneldefs.h"
 
namespace omnetpp {
 
// forward declarations
class cObject;
class cComponent;
 
// helpers for checked_int_cast
SIM_API void intCastError(const std::string& num, const char *errmsg=nullptr);
SIM_API void intCastError(const std::string& num, const cObject *context, const char *errmsg=nullptr);
 
template<typename ToInt, typename FromInt>
ToInt checked_int_cast(FromInt x, const char *errmsg=nullptr)
{
    static_assert(std::is_integral<ToInt>::value && std::is_integral<FromInt>::value, "checked_int_cast expects integers");
    ToInt res = x;
    if ((x<0) != (res<0) || x-res != 0)  // note: x!=res would result in warning: signed-unsigned comparison
        omnetpp::intCastError(std::to_string(x), errmsg);
    return res;
}
 
template<typename ToInt, typename FromInt>
ToInt checked_int_cast(FromInt x, const cObject *context, const char *errmsg=nullptr)
{
    static_assert(std::is_integral<ToInt>::value && std::is_integral<FromInt>::value, "checked_int_cast expects integers");
    ToInt res = x;
    if ((x<0) != (res<0) || x-res != 0)  // note: x!=res would result in warning: signed-unsigned comparison
        omnetpp::intCastError(std::to_string(x), context, errmsg);
    return res;
}
 
template<typename ToInt>
ToInt checked_int_cast(double d, const char *errmsg=nullptr)
{
    static_assert(std::is_integral<ToInt>::value, "checked_int_cast expects integer template argument");
    ToInt res = d;
    if ((double)res != std::trunc(d))
        omnetpp::intCastError(std::to_string(d), errmsg);
    return res;
}
 
SIM_API const char *opp_typename(const std::type_info& t);
 
SIM_API int64_t opp_get_monotonic_clock_nsecs();  // in gettime.cc
 
SIM_API int64_t opp_get_monotonic_clock_usecs();  // in gettime.cc
 
}  // namespace omnetpp
 
#endif