[Suggestion] Checking whether some opt keys exist & Specifying default values

[alex9801]

One possible syntax would be: bool has_n = has_opt<int>("n"); // true if integer n is specified as key, false otherwise int n = opt<int>("n", 100); // if integer n is not specified as key, returns default value 100

Also, it would be nice if bool type keys defaults to false, unless otherwise specified. It would suit -prop / --prop syntax better.

Currently, there is no way to implement such feature in user code without directly accessing __testlib_opts variable.

[cubercsl]

I meet the same issue. Make the bool type key false is very common in use. But now we can only use --key=false to solve it.

[MikeMirzayanov]

I implemented all except int n = opt("n", 100);

[alex9801]

A bit late, but #136 implements this feature. Great!