cs Oct 28

Oct 28

function overloading -operator overloading

f(2);
void f(int)
f()
void f()

compitle time binding -- early binding

run-time binding - late binding


Inheritance -- is-a
aggregation -- contains, has-a

ch12 - ch16

a point is a circle (could be with radius = 0)
a circle is a point (could be with radius )
a circle has a point
a point has a  circle

compile-time binding -- static
runtime-binding -- dynamic

runtime binding

Shape *sh;
Triangle T;
Square S;

T.draw();
S.draw();
Sh = &T;
Sh->draw();

or a function

f(Shape & s)
{
 s.draw()
}

inheritance hierarchy using pointers
using ponter to to the base object...

in C++ this is implemented using virtual functions.

add keyword virtual  (for this to work the compiler must add code to make it happen)
virtual void draw();  // possibly runtime polymorphism

invoke the function using a pointer.

1. invoke the function using a  pointer or reference to the object. sh->draw() or f(Shape& s)
2. virtual keyword.

Graphlib, javadoc

compile chapter.12.3.cpp

1. install  fltk-1.1.10-dev.tcz to access fltk dependent tools/libraries especially fltk-config

- Build the author's library
-compile chapter.12.3.cpp
-tangram lab(1) development

4th parameter is default..

sudo  find -name "simple_window.h"
sudo find / -name Fl.h



g++ -I ../GUI   chapter.12.3.cpp -lbookgui -L../GUI -fno-rtti `fltk-config --ldflgs --use-images`

Libraries lib___.a

compile -l libraryname(ending with .a)

atoi : ascii to integer..

1 < atoi("1")  <cstdlib>

/GUI directory ran make



editor GUI.cpp
added <cstdlib>
qualified atoi by std::atoi

fltk-config

fltk-config --compile program.cxx
fltk-config --libs

/usr/local/lib/libfltk.a

   --ldflags

-lfltk

RTTI (Runtime type Instantiation)

cd

adding -fno-rtti in makefile of /GUI for CXXflags

https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=fitting%20the%207%20tangram%20shapes%20into%20a%20square%20algorithm

Building the tangram square with the seven pieces.