Technical facts

Operating system(s) or programming environment(s)

Lubuntu 15.04 (vivid)

IDE(s):

Qt Creator 3.1.1

Project type:

Console application

C++ standard:

C++98

Compiler(s):

G++ 4.9.2

Libraries used:

STL: GNU ISO C++ Library, version 4.9.2

Qt project file: ./CppBoostUnitsBug/CppBoostUnitsBug.pro


include(../../ConsoleApplication.pri)

include(../../Libraries/Boost.pri)



SOURCES += main.cpp

./CppBoostUnitsBug/main.cpp


#include <cassert>



#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Weffc++"

#pragma GCC diagnostic ignored "-Wunused-local-typedefs"

#include <boost/units/systems/si/prefixes.hpp>      //nano,milli,kilo

#include <boost/units/systems/si/length.hpp>        //meter

#include <boost/units/systems/si/io.hpp>            // <<

#pragma GCC diagnostic pop



int main()

{

  //Works as expected

  {

    const boost::units::quantity<boost::units::si::length> a(

      1.23 * boost::units::si::meter);

    const boost::units::quantity<boost::units::si::length> b(

      1.23 * boost::units::si::milli * boost::units::si::meter);



    const double x = a / boost::units::si::meter;

    const double y = b / boost::units::si::meter;

    assert(x != y && "A meter is not a millimeter");



  }

  //Works as expected

  {

    const boost::units::quantity<boost::units::si::length> a(

      1.23 * boost::units::si::meter);

    const boost::units::quantity<boost::units::si::length> b(

      1.23 * boost::units::si::milli * boost::units::si::meter);



    const double x = a.value();

    const double y = b.value();

    assert(x != y && "A meter is not a millimeter");



  }

  //FAILS

  {

    assert( (1.23 * boost::units::si::meter).value()

      != (1.23 * boost::units::si::milli * boost::units::si::meter).value()

      && "A meter is not a millimeter");

  }

  //FAILS

  {

    const double x = (1.23 * boost::units::si::meter).value();

    const double y = (1.23 * boost::units::si::milli * boost::units::si::meter).value();

    assert(x != y && "A meter is not a millimeter");

  }

}

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(C++) BoostUnitsBug

Technical facts

Qt project file: ./CppBoostUnitsBug/CppBoostUnitsBug.pro

./CppBoostUnitsBug/main.cpp