>> That's why there are two overloads! One for const, one for non-const.
What, you expect me to actually read the code?
>> I'm just concerned about returning void from the FncPtr call.
Code:template < typename R > R foo( R ( *f )( ) ) { return f( ); } int bar( void ) { return 3114; } void qux( void ) { } int main( void ) { cout << foo( bar ) << endl; foo( qux ); return 0; }
Code:#include <cmath> #include <complex> bool euler_flip(bool value) { return std::pow ( std::complex<float>(std::exp(1.0)), std::complex<float>(0, 1) * std::complex<float>(std::atan(1.0) *(1 << (value + 2))) ).real() < 0; }
Aww, come on. It's not that big and complicated.Originally Posted by Sebastiani
>> That's why there are two overloads! One for const, one for non-const.
What, you expect me to actually read the code?
So this actually compiles, where you try to return "void"?
>> Aww, come on. It's not that big and complicated.
Oh I know, I should have paid closer attention.
>> So this actually compiles, where you try to return "void"?
Yep. As long as you don't try to explicitly declare a variable of that type, though (which is really too bad because that would have been a useful feature). So in other words, this would not compile if used with void:
Code:template < typename R > R foo( R ( *f )( ) ) { R r = f( ); return r; }
Code:#include <cmath> #include <complex> bool euler_flip(bool value) { return std::pow ( std::complex<float>(std::exp(1.0)), std::complex<float>(0, 1) * std::complex<float>(std::atan(1.0) *(1 << (value + 2))) ).real() < 0; }
Alright, cool, no worries about that then.
I cant read this because its looked...
And, I cant see but when I am compiling that, its returning a error:
What is wrong?Code:In function ‘void example2(Class_t&, Fnc_t) [with Class_t = ExClass, Fnc_t = int (ExClass::*)(const int&)]’: 16: instantiated from here 10: error: too few arguments to function
Ah, that's because the function takes an int, but we don't pass one. You can fix it like:
(Class.*FncPtr)(10);
func(10);
hmmmm that is what I was trying to avoid...
But I'm trying to use boost::function...
Do you know some really good book to indicate to me??? with this kind of doubt
Oh? Then let's borrow the power of boost::bind a little more:
example( boost::bind(&ExClass::func, f, 10) );
Notice that I put a number in there as well.
Now
func();
Simply will work.
Praised be boost!
What probably will solve my problem is:
isn't?Code:ExClass f; f.func = boost::bind( &ExClass::func, &f ); example( f.func );
But, do I really need to install all boost library to use boost::bind()???
It doesn't work that way! Just pass what boost::bind returns directly to your function.
You need to download the boost package, yes, but you don't need to install any dlls to use it. However, you can't just break it into pieces since it has dependencies on other headers in the boost distribution.
Code:ExClass f; example( boost::bind(&ExClass::func, f, 1000) );
Ok, and how about the book???
Can you suggest one??
To look up that kind of doubt?
Not much about boost, sadly.
There is one book about boost, I think. Can't remember its name. It's somewhat old and doesn't cover that much, but it's about the only one available or so. A search on the web should reveal more information about that.
Otherwise the boost homepage is your best source of information.
No no, not about boost... about c++, but not too beginer, I say intermediate!!!!
Oh, okay. Then check the books thread.
If you haven't checked out Accelerated C++, then you should probably do that too.
It doesn't cover just the basics; it covers a lot of more and a lot of it is handy stuff!
Ok, thank you all your attention and patient to my problem!!!!
