help with headder file containing class definition :)
Author
hello, I am trying to make a header file with a class definition. I declare the member functions from within the class definition. Should I define the member functions from within that same header file or should I make a second cpp file and include the headder file?
right now i am using the 2nd configuration and I cant seem to get it to compile.
what error do you get? sounds like you've forgot to put inclusion guards
in your header :) that usually gives that sort of problems.
#ifndef MY_HEADER_INCLUDED#define MY_HEADER_INCLUDED//.. teh funkay schtuff!#endif//MY_HEADER_INCLUDEDin your header :) that usually gives that sort of problems.
(header.h)
#pragma once
class myClass
{
public:
myClass();
~myClass();
private:
int classmember;
};
(end of header file )
(header.cpp)
#include header.h
myClass::myClass()
{
classmember = 6;
}
myClass::~myClass()
{
}
(end of cpp file )
the (end of file) and (header.h) means the diffrent documents.
This should work.
Greetings
*edit*
If you are using visual studios you can use pragma once. If not you should use #ifndef #define and #endif. Personally i always youse ifndef/define/endif
#pragma once
class myClass
{
public:
myClass();
~myClass();
private:
int classmember;
};
(end of header file )
(header.cpp)
#include header.h
myClass::myClass()
{
classmember = 6;
}
myClass::~myClass()
{
}
(end of cpp file )
the (end of file) and (header.h) means the diffrent documents.
This should work.
Greetings
*edit*
If you are using visual studios you can use pragma once. If not you should use #ifndef #define and #endif. Personally i always youse ifndef/define/endif
note that "#pragma once" is very compiler centric... but if you don't care about portability it's a very slick option and actually seems to reduce buildtimes.
Quote:Original post by DigitalDelusion
note that "#pragma once" is very compiler centric... but if you don't care about portability it's a very slick option and actually seems to reduce buildtimes.
heh you beat me before i could edit =)
Quote:Original post by Athos
heh you beat me before i could edit =)
you can call me "Speed Swede" ;)
Author
Hmm I did not use any of those tags.
the error I am getting is as follows
the class has a member function called draw, when I try to defin that function in the headder.cpp and compile It tells me that member function was not declared in the class. But it clearly is defined.
lines.h
lines.cpp
the error I am getting is as follows
the class has a member function called draw, when I try to defin that function in the headder.cpp and compile It tells me that member function was not declared in the class. But it clearly is defined.
lines.h
class Line;{ public: double X,Y,Len,Theta; int T = 1; Line(HWND, double, double, double, double, int, bool); Line(HWND, double, double, double, double, int); Line(); int draw(HWND); void Create(HWND, double, double, double, double, int, bool); int draw(HWND); private: HWND Hwnd; };lines.cpp
#include "lines.h"#include <math.h>#include <windows.h>int Line::draw(HWND Hwnd){ int hT = (T / 2); int virt = false; int horiz = false; int diag = false; int start[] = {(int) X, (int) Y}; int end[] = {(int) (cos(Theta) * Len), (int) (sin(Theta) * Len)}; //check to see if line is horizontle, virticle or diagonal. virt = (start[1] == end[1]) ? 1 : 0; horiz = (start[0] == end[0]) ? 2 : 0; diag = (start[1] == end[1]) && (start[0] == end[0]) ? 3 : 0; int lino = horiz + virt + diag; switch (lino) { case 1: { //draw line horiz HDC hDC; hDC = GetDC(Line::Hwnd); MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); if ( T > 4) { for(int c = 0; c < hT; c++) { start[1]++; end[1]++; MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); } start[0] = (int) X; start[1] = (int) Y; end[0] = (int) (cos(Theta) * Len); end[1] = (int) (sin(Theta) * Len); for(int c = 0; c < hT; c++) { start[1]--; end[1]--; MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); } } ReleaseDC(Hwnd,hDC); break; } case 2: { //draw line virt HDC hDC; hDC = GetDC(Line::Hwnd); MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); if ( T > 4) { for(int c = 0; c < hT; c++) { start[0]++; end[0]++; MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); } start[0] = (int) X; start[1] = (int) Y; end[0] = (int) (cos(Theta) * Len); end[1] = (int) (sin(Theta) * Len); for(int c = 0; c < hT; c++) { start[0]--; end[0]--; MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); } } ReleaseDC(Hwnd,hDC); break; } case 3: { //draw line diag HDC hDC; hDC = GetDC(Line::Hwnd); MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); if ( T > 4) { int Signx; int Signy; if(start[0] < end[0]) Signx = 1; if(start[1] < end[1]) Signy = 1; if(start[0] > end[0]) Signy = 0; if(start[1] > end[1]) Signy = 0; if (Signx == Signy) { for(int c = 0; c < hT; c++) { start[0]++; end[0]++; start[1]++; end[1]++; MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); } start[0] = (int) X; start[1] = (int) Y; end[0] = (int) (cos(Theta) * Len); end[1] = (int) (sin(Theta) * Len); for(int c = 0; c < hT; c++) { start[0]--; end[0]--; start[1]--; end[1]--; MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); } } if(Signx != Signy) { for(int c = 0; c < hT; c++) { start[0]++; end[0]++; start[1]--; end[1]--; MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); } start[0] = (int) X; start[1] = (int) Y; end[0] = (int) (cos(Theta) * Len); end[1] = (int) (sin(Theta) * Len); for(int c = 0; c < hT; c++) { start[0]--; end[0]--; start[1]++; end[1]++; MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); } } } ReleaseDC(Hwnd,hDC); break; } } return 0;}Line::Line(HWND lHwnd, double lx, double ly, double lLen, double lTheta, int lT, bool drw) { X = lx; Y = ly; Len = lLen; Theta = lTheta; T = lT; Hwnd = lHwnd; if(drw) draw(Hwnd); } Line::Line(HWND lHwnd, double lx, double ly, double lLen, double lTheta, int lT) { X = lx; Y = ly; Len = lLen; Theta = lTheta; T = lT; Hwnd = lHwnd;} Line::Line(){} void Line::Create(HWND lHwnd, double lx, double ly, double lLen, double lTheta, int lT, bool drw){ X = lx; Y = ly; Len = lLen; Theta = lTheta; T = lT; Hwnd = lHwnd; if(drw) draw(Hwnd);}
Author
added the inclusion guard and fixed the double declaration of draw. I am still getting the same compil error.
The compiler stops at the first use of draw() in the lines.cpp file.
the exact error is as follows
"In constructor `Line::Line(HWND__*, double, double, double, double, int, bool)':
`draw' undeclared (first use this function) "
Now that is just not true because it is declared in the class definition.
am I doing something wrong?
here is the current code.
lines.h
lines.cpp
The compiler stops at the first use of draw() in the lines.cpp file.
the exact error is as follows
"In constructor `Line::Line(HWND__*, double, double, double, double, int, bool)':
`draw' undeclared (first use this function) "
Now that is just not true because it is declared in the class definition.
am I doing something wrong?
here is the current code.
lines.h
#include <math.h>#ifndef _LINES_HEADDER#define _LINES_HEADDERclass Line;{ public: double X,Y,Len,Theta; int T = 1; Line(HWND, double, double, double, double, int, bool); Line(HWND, double, double, double, double, int); Line(); int draw(HWND); void Create(HWND, double, double, double, double, int, bool); private: HWND Hwnd; };#endiflines.cpp
#include "lines.h"#include <math.h>#include <windows.h>Line::Line(HWND lHwnd, double lx, double ly, double lLen, double lTheta, int lT, bool drw) { X = lx; Y = ly; Len = lLen; Theta = lTheta; T = lT; Hwnd = lHwnd; if(drw) draw(Hwnd); } Line::Line(HWND lHwnd, double lx, double ly, double lLen, double lTheta, int lT) { X = lx; Y = ly; Len = lLen; Theta = lTheta; T = lT; Hwnd = lHwnd;} Line::Line(){} void Line::Create(HWND lHwnd, double lx, double ly, double lLen, double lTheta, int lT, bool drw){ X = lx; Y = ly; Len = lLen; Theta = lTheta; T = lT; Hwnd = lHwnd; if(drw) draw(Hwnd);} int Line::draw(HWND Hwnd){ int hT = (T / 2); int virt = false; int horiz = false; int diag = false; int start[] = {(int) X, (int) Y}; int end[] = {(int) (cos(Theta) * Len), (int) (sin(Theta) * Len)}; //check to see if line is horizontle, virticle or diagonal. virt = (start[1] == end[1]) ? 1 : 0; horiz = (start[0] == end[0]) ? 2 : 0; if((virt + horiz) == 0) diag = 3; else diag = 0; int lino = horiz + virt + diag; switch (lino) { case 1: { //draw line horiz HDC hDC; hDC = GetDC(Line::Hwnd); MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); if ( T > 4) { for(int c = 0; c < hT; c++) { start[1]++; end[1]++; MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); } start[0] = (int) X; start[1] = (int) Y; end[0] = (int) (cos(Theta) * Len); end[1] = (int) (sin(Theta) * Len); for(int c = 0; c < hT; c++) { start[1]--; end[1]--; MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); } } ReleaseDC(Hwnd,hDC); break; } case 2: { //draw line virt HDC hDC; hDC = GetDC(Line::Hwnd); MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); if ( T > 4) { for(int c = 0; c < hT; c++) { start[0]++; end[0]++; MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); } start[0] = (int) X; start[1] = (int) Y; end[0] = (int) (cos(Theta) * Len); end[1] = (int) (sin(Theta) * Len); for(int c = 0; c < hT; c++) { start[0]--; end[0]--; MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); } } ReleaseDC(Hwnd,hDC); break; } case 3: { //draw line diag HDC hDC; hDC = GetDC(Line::Hwnd); MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); if ( T > 4) { int Signx; int Signy; if(start[0] < end[0]) Signx = 1; if(start[1] < end[1]) Signy = 1; if(start[0] > end[0]) Signy = 0; if(start[1] > end[1]) Signy = 0; if (Signx == Signy) { for(int c = 0; c < hT; c++) { start[0]++; end[0]++; start[1]++; end[1]++; MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); } start[0] = (int) X; start[1] = (int) Y; end[0] = (int) (cos(Theta) * Len); end[1] = (int) (sin(Theta) * Len); for(int c = 0; c < hT; c++) { start[0]--; end[0]--; start[1]--; end[1]--; MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); } } if(Signx != Signy) { for(int c = 0; c < hT; c++) { start[0]++; end[0]++; start[1]--; end[1]--; MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); } start[0] = (int) X; start[1] = (int) Y; end[0] = (int) (cos(Theta) * Len); end[1] = (int) (sin(Theta) * Len); for(int c = 0; c < hT; c++) { start[0]--; end[0]--; start[1]++; end[1]++; MoveToEx(hDC, end[0], end[1], NULL); LineTo(hDC, start[0], start[1]); } } } ReleaseDC(Hwnd,hDC); break; } } return 0;}This topic is closed to new replies.
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