warning C4002: too many actual parameters for macro 'assert'

Hi,

This compiles:

Code:

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double a = cmath::euclideanDistance2D<BlasVector,double>(mTargetPosition, mrEntity.vehicleModel().pos());

assert(10.0 < a);

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But for this

Code:

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assert(10.0 < cmath::euclideanDistance2D<BlasVector,double>(mTargetPosition, mrEntity.vehicleModel().pos()));

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msvc gives these erros and warnings:

Code:

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1>.\GoalMoveXY.cpp(46) : warning C4002: too many actual parameters for macro 'assert'
1>.\GoalMoveXY.cpp(46) : error C2143: syntax error : missing ',' before ')'
1>.\GoalMoveXY.cpp(46) : error C2059: syntax error : ')'
1>.\GoalMoveXY.cpp(46) : error C2143: syntax error : missing ',' before ')'
1>.\GoalMoveXY.cpp(46) : error C2059: syntax error : ')'
1>.\GoalMoveXY.cpp(50) : error C2143: syntax error : missing ',' before ')'
1>.\GoalMoveXY.cpp(53) : error C2065: 'way' : undeclared identifier
1>.\GoalMoveXY.cpp(53) : error C2228: left of '.rend' must have class/struct/union
1>        type is ''unknown-type''
1>.\GoalMoveXY.cpp(53) : error C2143: syntax error : missing ',' before ')'
1>.\GoalMoveXY.cpp(56) : error C2143: syntax error : missing ';' before '}'
1>.\GoalMoveXY.cpp(60) : error C2143: syntax error : missing ';' before '{'
1>.\GoalMoveXY.cpp(65) : error C2143: syntax error : missing ';' before '{'
1>.\GoalMoveXY.cpp(68) : error C2143: syntax error : missing ';' before '}'
1>.\GoalMoveXY.cpp(70) : error C2143: syntax error : missing ';' before '{'
1>.\GoalMoveXY.cpp(71) : error C2143: syntax error : missing ',' before ')'
1>.\GoalMoveXY.cpp(72) : error C2143: syntax error : missing ',' before ')'
1>.\GoalMoveXY.cpp(81) : error C2143: syntax error : missing ';' before '{'
1>.\GoalMoveXY.cpp(83) : error C2143: syntax error : missing ';' before '}'
1>.\GoalMoveXY.cpp(84) : error C2143: syntax error : missing ';' before '}'
1>.\GoalMoveXY.cpp(87) : error C2143: syntax error : missing ';' before '}'
1>.\GoalMoveXY.cpp(90) : error C2143: syntax error : missing ';' before '}'
1>.\GoalMoveXY.cpp(91) : error C2143: syntax error : missing ';' before '}'
1>.\GoalMoveXY.cpp(91) : fatal error C1004: unexpected end-of-file found

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Arn't template parameters allowed inside macro calls?

Thank you!

They probably are, but perhaps you need an extra set of paranthesis, as the preprocessor has no idea what a template is, and will just split arguments by commas.

--
Mats

More precisely, it doesn't recognize < > as comma-masking. So yes, you need an extra pair of parenthesis.

Quote:

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Originally Posted by CornedBee

More precisely, it doesn't recognize < > as comma-masking. So yes, you need an extra pair of parenthesis.

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Yes, but the C preprocessor knows nothing ELSE about templates either, does it?

--
Mats

But it doesn't need to know anything else. It's the commas that get you in trouble.

Quote:

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Originally Posted by CornedBee

But it doesn't need to know anything else. It's the commas that get you in trouble.

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You are right - there is no meaning to template that would matter to the preprocessor. I was trying (hard) to come up with some other obscure case where template "knowledge" would make a difference, but the only place which matters is commas in the <> section of templates.

--
Mats

I guess the preprocessor sees it as:

Code:

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assert(x < y < z,double>(mTargetPosition, mrEntity.vehicleModel().pos()));

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Yes, something like that. There are very few things in the syntax that matters to the preprocessor. It knows about whitespaces, comma, lparen '(' and rparen ')', the # sign, and that's about it. The rest of it is about text replacement of given parameters.

--
Mats

Thank you all. Another pair of parenthesis did the trick.

Strings. It knows about strings. ;)

Quote:

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Originally Posted by CornedBee

Strings. It knows about strings. ;)

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Yes, of course. As in "somestuff", not std::strings ;)

--
Mats

In case you want to "protect" a comma and parenthesis don't work (for example with templates), you can use the following macro:

Code:

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#define CONCAT(...) __VA_ARGS__
#define ID(x) x
//...
printf("%s %s!\n", ID(CONCAT("hello", "world")) );

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See more on my website...

HTH,
Ingo

O_o

Did you actually just search for questions to answer in order to advertise your site as a pathetic attempt to circumvent the rules?

Anyway, this is the C++ forum--not the C99 forum.

Soma

Quote:

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Originally Posted by phantomotap

O_o

Did you actually just search for questions to answer in order to advertise your site as a pathetic attempt to circumvent the rules?

Anyway, this is the C++ forum--not the C99 forum.

Soma

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lol my thought too

Link deleted, thread closed. Don't resurrect old threads, especially in order to promote your site.