Re: [Vala] Converting library by hand

[Frederik <scumm_fredo gmx net>]

Nicolas wrote:
> Hi,
>
> Thank you very much to answer me !
> Ok, i will try to port this library by hand.
>
> So can you give me an example to convert some kind of code for vapi file.
>
> First:
>
> typedef enum de_crossover_t
>  {
>  GA_DE_CROSSOVER_UNKNOWN = 0,
>  GA_DE_CROSSOVER_BINOMIAL = 1,
>  GA_DE_CROSSOVER_EXPONENTIAL = 2
>  } ga_de_crossover_type;
>
>
> Second:
>
> GAULFUNC population *ga_population_new(    const int stable_size,
>                const int num_chromosome,
>                const int len_chromosome);
>
> Third:
>
> GAULFUNC boolean    ga_seed_boolean_random(population *pop, entity *adam);
>
> Thank you in advance.
> Nicolas.

You could start with this 'gaul.vapi'. (attachment)

There are two alternatives for 'ga_seed_boolean_random': you can bind it
either as static function or as instance method of class 'Population'.

All classes are [Compact], because they are non-GObject types.

While writing a vapi file by hand it is helpful to look at the generated
C code of a test program that uses the newly added functions:

$ valac gaultest.vala --pkg gaul --vapidir . -C

Sometimes you can rely on the default name prefixes and sometimes you
must override them with [CCode (...)] attributes.


Best Regards,

Frederik

[CCode (lower_case_cprefix = "ga_", cheader_filename = "gaul.h")]
namespace GAUL {

        [CCode (cname = "ga_de_crossover_type", cprefix = "GA_DE_CROSSOVER_")]
        enum DECrossoverType {
                UNKNOWN,
                BINOMIAL,
                EXPONENTIAL
        }

        [Compact]
        [CCode (cname="population", free_function = "ga_extinction")]
        public class Population {
                public Population (int stable_size, int num_chromosome,
                                   int len_chromosome); 
                public void set_mutation (double mutation);
                // Alternative A:
                [CCode (cname = "ga_seed_boolean_random")]
                public bool seed_boolean_random (Entity adam);
        }

        [Compact]
        [CCode (cname="entity")]
        public class Entity {
        }

        // Alternative B:
        public static bool seed_boolean_random (Population pop, Entity adam);
}