Multiple file compilation error
I am starting to create my GUI toolkit project for the X Window System, and I created these classes, each of which has a .h and .cpp file:
Dimension (actually contains 3 classes, Dimension, FloatDimension, and BoolDimension): An object to contain an x, y pair.
Application: Initializes the resources used by the widgets, manages the event loop.
TopLevelWindow: A window.
Each of these individually compile into a .o file just fine, but my test program that uses them gives an error:
Code:
#include "Dimension.h"
#include "Application.h"
#include "TopLevelWindow.h"
int main() {
Application app;
TopLevelWindow win(app, "Test", Dimension(3, 3));
win.pack();
win.show();
app.eventLoop();
return 0;
}
In case you don't know the g++ command, this is an explanation in english:
g++ compile-only-no-linker include-library-X11 file:src/main.cpp
Code:
$ g++ -c -lX11 src/main.cpp
In file included from src/TopLevelWindow.h:5,
from src/main.cpp:4:
src/Application.h:3: error: redefinition of ‘class Application’
src/Application.h:3: error: previous definition of ‘class Application’
In file included from src/TopLevelWindow.h:7,
from src/main.cpp:4:
src/Dimension.h:1: error: redefinition of ‘class Dimension’
src/Dimension.h:1: error: previous definition of ‘class Dimension’
src/Dimension.h:10: error: redefinition of ‘class FloatDimension’
src/Dimension.h:10: error: previous definition of ‘class FloatDimension’
src/Dimension.h:18: error: redefinition of ‘class BoolDimension’
src/Dimension.h:18: error: previous definition of ‘class BoolDimension’
src/main.cpp: In function ‘int main()’:
src/main.cpp:7: error: no matching function for call to ‘TopLevelWindow::TopLevelWindow(Application&, const char [10], Dimension)’
src/TopLevelWindow.h:16: note: candidates are: TopLevelWindow::TopLevelWindow(Application*, std::string, Dimension)
src/TopLevelWindow.h:8: note: TopLevelWindow::TopLevelWindow(const TopLevelWindow&)
I have no idea what's going on. Can anyone help me fix this?
