source: tests/except-2.c @ 9ad5ee1

// New draft of exception tests.


#include <stdlib.hfa>
#include "except-mac.h"

TRIVIAL_EXCEPTION(yin)
TRIVIAL_EXCEPTION(yang)

struct num_error;
struct num_error_vtable {
        struct TABLE(BASE_EXCEPT) const * parent;
        size_t size;
        void (*copy)(num_error *this, num_error * other);
        void (*free)(num_error *this);
        const char * (*msg)(num_error *this);
        int (*code)(num_error *this);
};
extern num_error_vtable INSTANCE(num_error);

struct num_error {
        struct num_error_vtable const * virtual_table;
        char * msg;
        int num;
};

void num_error_msg(num_error * this) {
        if ( ! this->msg ) {
                static const char * base = "Num Error with code: X";
                this->msg = malloc(22);
                for (int i = 0 ; (this->msg[i] = base[i]) ; ++i);
        }
        this->msg[21] = '0' + this->num;
        return this->msg;
}
void ?{}(num_error * this, int num) {
        this->virtual_table = &INSTANCE(num_error);
        this->msg = 0;
        this->num = num;
}
void ?{}(num_error * this, num_error * other) {
        this->virtual_table = other->virtual_table;
        this->msg = 0;
        this->num = other->num;
}
void ^?{}(num_error * this) {
        if( this->msg ) free( this->msg );
}
int num_error_code( num_error * this ) {
        return this->num;
}
num_error_vtable _num_error_vtable_instance @= {
        &INSTANCE(BASE_EXCEPT),
        sizeof(num_error), ?{}, ^?{},
        num_error_msg, num_error_code
};


// Test simple throwing, matching and catching.
void throw_catch() {
        try {
                yin black;
                THROW(&black);
        } catch ( yin * error ) {
                printf("throw yin caught.\n");
        }

        try {
                yang white;
                THROW_RESUME(&white);
                printf("> throwResume returned.\n");
        } catchResume ( yang * error ) {
                printf("throwResume yang caught <");
        }

        try {
                num_error x = { 2 };
                THROW(&x);
        }
        catch (num_error * error ; 3 == error->virtual_table->code( error ) ) {
                printf("exception at %p\n", error );
                printf("Should not be printed.\n");
        }
        catch (num_error * error ; 2 == error->virtual_table->code( error ) ) {
                printf("Should be printed.\n");
        }
}

int main (int argc, char * argv[]) {
        throw_catch();
        return 0;
}