On Tuesday, 8 March 2022 at 17:47:47 UTC, BoQsc wrote:
> Premise: In D language, only one main(){} function can exist in a program.
Having two main()
functions throws an error.
Let's say I want to use some functionality of another program, but it has a main(){}
function. How can I import and use functions without importing the main(){}
function?
You'll have to modify the other program to exclude the main
function from compilation.
For example, you could use a version
condition:
module otherprogram;
version (Otherprogram_NoMain)
{
// no main function
}
else
{
void main(string[] args)
{
// ...
}
}
// other functions...
Then, when you're compiling the program that uses it, you can pass -version=Otherprogram_NoMain
on the command line:
$ dmd -version=Otherprogram_NoMain myprogram.d otherprogram.d
This will include the main
function from myprogram.d
, but exclude the one from otherprogram.d
.