Creating .lib?

[explosive]

Hi,

I am trying to include some pre-written code into my project from: http://finance.bi.no/~bernt/gcc_prog.../doc_date.html

Im having some trouble getting it to work. I am using MSVC++6.

I don't understand this instruction:

Compile date.cc, put into library libdate.a, make library available.

Ive tried adding date.cc and the date.h header file to the project but I just get an error when I try to use any of its functions.

How do I compile the date.cc to a .lib?

[andyhunter]

I think this thread covers multiple file use pretty well. You don't need to make a lib or dll for this. If you are still having problems why don't you at least tell use what the error messages are.

[explosive]

I get this error:

error C2679: binary '-' : no operator defined which takes a right-hand operand of type 'class date' (or there is no acceptable conversion)

Im trying to implement it like this:

int day=0;
date d1(20050310);
date d2(20050207);

day = d2-d1
cout<<day;

Ive included both date.cc and date.h in my project.

[CornedBee]

Well, if you look at the header you'll find that there is no operator - that takes two dates. In other words, substracting two dates simply isn't supported by the class you have.

I've also noticed another oddity in there. I didn't know combined assignment operators could be global.

[explosive]

Thats strange because on the site it says:

Some aritmetric operations are defined, which has a meaning that may seem strange at first, but they are natural for usage purposes.

Adding/Subtracting number of days from a data:

d=d1+7 gives d the date 7 days after date d1.

d=d1-7 gives d the date 7 days before date d1.

Finding the number of days between 2 dates. i=d1-d2. Here i is an integer that is the number of days between d1 and d2. i will be negative if d1 d2.

Example:

date d1(30,6,1993); date d2(19930610);
i = d1-d2

Gives i the value 20, the number of days between 10 jun 93 and 30 jun 93.

Shame it doesn't work

Do you know of a way I could find the number of days between 2 dates?

[CornedBee]

Sure. Use a proper library.