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Visual c++ code to DEV C++ (mingw)
Posted: Tue Jul 11, 2006 10:56 am
by 0Scoder
Hi. I have the source to a library writen in Visual C++ which I need. However, I do not have this, so I have resorted to trying to get it to compile in DEV C++ (since it's free). However, I have come up against various problems:
During compiling, I got the following error report:
Code: Select all
mrEntity.cpp: In constructor `mrEntity::mrEntity()':
mrEntity.cpp:17: error: no match for 'operator=' in '
this->mrEntity::m_kCenterOfMass = mrVector2D(0.0, 0.0)'
mrVector2D.h:27: error: candidates are: mrVector2D&
mrVector2D::operator=(mrVector2D&)
For the following bits of code:
Code: Select all
class mrEntity
{
protected:
/* Physical attributes */
mrVector2D m_kCenterOfMass;
}
mrEntity::mrEntity (void)
{
m_kCenterOfMass = mrVector2D (0, 0); /*---THIS IS WHERE THE ERROR OCCURS---*/
}
Code: Select all
mrVector2D & operator = (mrVector2D & rkVector);
Can anyone explain what I might need to change to make this code work? (Do you need to see more of it?). Also, is there a list anywhere of these compiler incompatibilities, and how to fix them?
Re:Visual c++ code to DEV C++ (mingw)
Posted: Tue Jul 11, 2006 11:06 am
by mystran
Try make a method with prototype:
[tt]mrVector2D & mrVector2D::operator=(
const mrVector2D&)[/tt]
Oh, and Visual C++ is probably the incompatible compiler here.
Re:Visual c++ code to DEV C++ (mingw)
Posted: Tue Jul 11, 2006 11:24 am
by Ryu
Well what exactly does the call
mrVector2D (0, 0) return? If its not a referance to mrVector2D then the compiler may not see any matches within all operator= overloads. Thats what I suspect from the error "no match" anyway.
edit:
My bad, after rereading closely I figured its a constructor.. if Mystran's antidote doesn't work you can avoid the operator= itself by changing to:
Code: Select all
mrEntity::mrEntity (void) : m_kCenterOfMass(0, 0)
{
}
I'm not sure if its c++ standard you can initialize members this way.
Re:Visual c++ code to DEV C++ (mingw)
Posted: Tue Jul 11, 2006 1:06 pm
by Candy
Ryu wrote:
Well what exactly does the call mrVector2D (0, 0) return? If its not a referance to mrVector2D then the compiler may not see any matches within all operator= overloads. Thats what I suspect from the error "no match" anyway.
It returns a temporary mrVector2D, which is implicitly const and will be implicitly destroyed after the assignment operator call. Visual Studio didn't work well with const (as in, plain ignored most of it) so the code would've worked in VC++. GNU GCC is more compliant to the standard which says that this construction should not compile, as the assignment constructor you provide doesn't say it won't change the argument passed by reference, and the argument you're trying to pass can't be modified.
Re:Visual c++ code to DEV C++ (mingw)
Posted: Tue Jul 11, 2006 1:27 pm
by Ryu
Candy wrote:
It returns a temporary mrVector2D, which is implicitly const and will be implicitly destroyed after the assignment operator call. Visual Studio didn't work well with const (as in, plain ignored most of it) so the code would've worked in VC++. GNU GCC is more compliant to the standard which says that this construction should not compile, as the assignment constructor you provide doesn't say it won't change the argument passed by reference, and the argument you're trying to pass can't be modified.
Ahh I see, I'm gotten use to VC++ style, its pretty much the only compiler I really ever used. Thanks for the bit of information.
Re:Visual c++ code to DEV C++ (mingw)
Posted: Tue Jul 11, 2006 3:07 pm
by earlz
I know That this is the cheating way but...
you could use codeblocks(an ide) and it supports multiple compilers(even in the same project!) including the MSVCtoolkit(or express)
Re:Visual c++ code to DEV C++ (mingw)
Posted: Wed Jul 12, 2006 1:11 pm
by JAAman
I do not have this, so I have resorted to trying to get it to compile in DEV C++ (since it's free)
just for clarification
Visual Studio is also free (download it for free on the MS website)