wrong code posted. see down!
the error i get is:
what exactly am i doing wrong?Code:bbb.cpp: In member function `int bbb::getSomething(int) const': bbb.cpp:261: passing `const aaa' as `this' argument of `int aaa::getSomething()' discards qualifiers
thank!
Last edited by rox; 03-09-2004 at 06:41 PM.
Just change the base-class's function signature to const (a const function isn't supposed to call a non-const function).
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; }
sorry, i think i pasted the wrong segment of code...
in aaa i got:
and in bbb:Code:const char* getSomething();
Code:aaa somearray[10];Code:const char* bbb::getSomething(int i) const{ if(i <= index) return somearray[i].getSomething(); else return '\0'; }
Last edited by rox; 03-09-2004 at 06:42 PM.
You cannot call aaa's getsomething from an object of type bbb unless:
- bbb is derived publicly from aaa and getsomething() is declared as public or protected.
I.E.
Code:class aaa { public: aaa(void) {}; int getsomething(void); }; class bbb:public aaa { public: bbb(void) {}; } int main(void) { bbb *mybbb=new bbb; int val=mybbb->getsomething(); return(0); }- a pointer to an object of type aaa is used to call getsomething() from an object of type bbb and getsomething() is declared as a public function in aaa.
I.E.
Code:class aaa { public: aaa(void) {}; int getsomething(void); }; class bbb { aaa *ptrtoaaa; public: bbb(aaa *myaaaa) {ptrtoaaa=myaaa;}; aaa *GetMyAAA(void) {return ptrtoaaa;}; };- bbb is actually an instantiated object of type aaa.
I.E.
Code:aaa *bbb=new aaa; bbb->getsomething();
And your use of the array in bbb along with a call to aaa's getsomething() looks very suspect.
i think i understand the idea, and i think it's case 3...
one of the data members in class bbb is an array of objects type aaa.
i'm trying to return from a member function in bbb the return of a member function from aaa for a certain element of the array of objects type aaa.
right?
damn i got my brain all twisted now.
but i'm not using pointer. in aaa the return is an string (constant), and same in bbb.
or is it a pointer...
ok, i've been on this for too long, i need to take a step back and think.
Last edited by rox; 03-09-2004 at 07:10 PM.
Did you try what I suggested?
Changing:
>> const char* getSomething();
to:
>> const char* getSomething() const;
...should stop the compiler warning.
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; }
yes i did, i got it to work.
THank you!
