mrb_value mrb_ary_new(mrb_state *mrb);
Initializes an array.
In this example we read from a Ruby file inside C. The Ruby code will print what you pass as an argument and what class the passed in value is. In this case we are declaring a variable new_ary of data type mrb_value. Then we are initializing it with the mrb_ary_new function which only takes an mruby state as an argument. “`C
int main(int argc, char *argv[]) { mrb_value new_ary; // Declare variable.
mrb_state *mrb = mrb_open(); if (!mrb) { handle error } FILE *fp =
fopen(“test.rb”,“r”); new_ary = mrb_ary_new(mrb); mrb_value obj =
mrb_load_file(mrb,fp); mrb_funcall(mrb, obj, “method_name”, 1, new_ary);
fclose(fp); mrb_close(mrb); return 0; } test.rb Ruby class
Example_Class def method_name(a) puts a puts a.class end end
Example_Class.new “`
void mrb_ary_push(mrb_state*, mrb_value, mrb_value);
Pushes given value into an array.
In this example we read from a Ruby file inside C. The Ruby code will print what you pass as an argument and what class the passed in value is. In this case after initializing our array. We are declaring two variables with the mrb_int data type random_value1 & random_value2 and we initialize them 70 and 60 respectively. Then we use the mrb_ary_push function to push values those values into the array. “`C
int main(int argc, char *argv[]) { mrb_value new_ary; // Declare variable.
mrb_int random_value1 = 70; // Initialize variable mrb_int random_value2 =
60; // Initialize variable mrb_state *mrb = mrb_open(); if (!mrb) {
handle error } FILE fp = fopen(“test.rb”,“r”); new_ary =
mrb_ary_new(mrb); // Initialize ruby array. / Pushes the fixnum value
from random_value1 to the new_ary instance. / mrb_ary_push(mrb,
new_ary, mrb_fixnum_value(random_value1)); / Pushes the fixnum value
from random_value2 to the new_ary instance. */ mrb_ary_push(mrb, new_ary,
mrb_fixnum_value(random_value2)); mrb_value obj = mrb_load_file(mrb,fp);
mrb_funcall(mrb, obj, “method_name”, 1, new_ary); fclose(fp);
mrb_close(mrb); return 0; } test.rb Ruby class Example_Class
def method_name(a) puts a puts a.class end end Example_Class.new
#### Result After compiling you should get these results. Ruby [70,
60] Array “`
mrb_value mrb_ary_pop(mrb_state *mrb, mrb_value ary);
Pops the last element from the array.
In this example we read from a Ruby file inside C. The Ruby code will print what you pass as an argument and what class the passed in value is. In this case after initializing our array. We are declaring two variables with the mrb_int data type random_value1 & random_value2 and we initialize them 70 and 60 respectively. Then we use the mrb_ary_push function to push values those values into the array. Now here in the Ruby files we add another method called pop_ary that will return the array alone(just to be clean) and you should see the last element gone. “`C
int main(int argc, char *argv[]) { mrb_value new_ary; // Declare variable.
mrb_int random_value1 = 70; // Initialize variable mrb_int random_value2 =
60; // Initialize variable mrb_state mrb = mrb_open(); if (!mrb) {
/ handle error */ } FILE fp = fopen(“test.rb”,“r”); new_ary =
mrb_ary_new(mrb); // Initialize ruby array. / Pushes the fixnum value
from random_value1 to the new_ary instance. / mrb_ary_push(mrb,
new_ary, mrb_fixnum_value(random_value1)); / Pushes the fixnum value
from random_value2 to the new_ary instance. */ mrb_ary_push(mrb, new_ary,
mrb_fixnum_value(random_value2)); mrb_value obj = mrb_load_file(mrb,fp);
mrb_funcall(mrb, obj, “method_name”, 1, new_ary); mrb_ary_pop(mrb,
new_ary); // Pops the last element of the array. In this case 60.
mrb_funcall(mrb, obj, “pop_ary”, 1, new_ary); // Calls the method again to
show the results. fclose(fp); mrb_close(mrb); return 0; } test.rb
Ruby class Example_Class def method_name(a) puts a puts a.class
end def pop_ary(a) puts a end end Example_Class.new #### Result
After compiling you should get these results. Ruby [70, 60] Array [70] ## mrb_ary_ref C
mrb_value mrb_ary_ref(mrb_state *mrb, mrb_value ary, mrb_int n);
Returns a reference to an element of the array. Specified by the value
given to mrb_int n. #### Example In this example we read from a Ruby file
inside C. The Ruby code will print what you pass as an argument and what
class the passed in value is. In this case we're declaring a variable
ary_ref with the data type of mrb_value. Then we assign mrb_ary_ref to it
getting new_ary's value at index 1. C
int main(int argc, char *argv[]) { mrb_value ary_ref; // Declare variable.
mrb_value new_ary; // Declare variable. mrb_int random_value1 = 70; //
Initialize variable mrb_int random_value2 = 60; // Initialize variable
mrb_state mrb = mrb_open(); if (!mrb) { / handle error / }
FILE fp = fopen(“test.rb”,“r”); new_ary = mrb_ary_new(mrb); // Initialize
ruby array. / Pushes the fixnum value from random_value1 to the new_ary
instance. / mrb_ary_push(mrb, new_ary, mrb_fixnum_value(random_value1));
/ Pushes the fixnum value from random_value2 to the new_ary instance. /
mrb_ary_push(mrb, new_ary, mrb_fixnum_value(random_value2)); ary_ref =
mrb_ary_ref(mrb, new_ary, 1); // Gets the value of new_ary’s second element
at index 1. mrb_value obj = mrb_load_file(mrb,fp); / Passing the value
from ary_ref to the method method_name./ mrb_funcall(mrb, obj,
“method_name”, 1, ary_ref); fclose(fp); mrb_close(mrb); return 0; }
test.rb Ruby class Example_Class def method_name(a) puts a
puts a.class end end Example_Class.new #### Result After compiling
you should get these results. Ruby 60 Fixnum “`
void mrb_ary_set(mrb_state *mrb, mrb_value ary, mrb_int n, mrb_value val);
Sets a value to an index.
In this example we read from a Ruby file inside C. The Ruby code will print what you pass as an argument and what class the passed in value is. In this case we’re declaring a variable ary_ref with the data type of mrb_value. Then we assign mrb_ary_ref to it getting new_ary’s value at index 1. “`C
int main(int argc, char *argv[]) { mrb_value new_ary; mrb_value ary_obj;
mrb_int random_value1 = 70; mrb_int random_value2 = 60; mrb_state mrb
= mrb_open(); if (!mrb) { / handle error / } FILE fp =
fopen(“test.rb”,“r”); new_ary = mrb_ary_new(mrb); mrb_ary_push(mrb,
new_ary, mrb_fixnum_value(random_value1)); mrb_ary_push(mrb, new_ary,
mrb_fixnum_value(random_value2)); / Sets the fixnum value of 7 to the
second index of the array./ mrb_ary_set(mrb, new_ary, 2,
mrb_fixnum_value(7)); mrb_value obj = mrb_load_file(mrb,fp);
mrb_funcall(mrb, obj, “before_after”, 1, new_ary); fclose(fp);
mrb_close(mrb); return 0; } test.rb Ruby class Example_Class
def method_name(a) puts a puts a.class end def before_after(a) puts a
end end Example_Class.new #### Result After compiling you should get
these results. Ruby [70, 60, 7] “`
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