mirror of
https://github.com/mruby/mruby
synced 2026-06-08 16:11:16 +00:00
Ralph Desir
97 lines
2.1 KiB
Markdown
97 lines
2.1 KiB
Markdown
### mrb_hash_new
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```C
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mrb_value mrb_hash_new(mrb_state *mrb);
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```
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Initializes a hash.
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#### Example
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In this example we read from a Ruby file inside C. The Ruby code will print what you pass as an argument
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and what class the passed in value is. This example initializes a hash. In pure Ruby doing this is equivalent
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to Hash.new.
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```C
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#include <stdio.h>
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#include <mruby.h>
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#include "mruby/hash.h" // Needs the hash header.
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#include "mruby/compile.h"
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int main(int argc, char *argv[])
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{
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mrb_state *mrb = mrb_open();
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if (!mrb) { /* handle error */ }
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mrb_value new_hash; // Declare variable.
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FILE *fp = fopen("test_ext.rb","r");
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new_hash = mrb_hash_new(mrb); // Initialize hash.
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mrb_value obj = mrb_load_file(mrb,fp);
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mrb_funcall(mrb, obj, "method_name", 1, new_hash);
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fclose(fp);
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mrb_close(mrb);
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return 0;
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}
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```
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#### test_ext.rb
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``` Ruby
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class Example_Class
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def method_name(a)
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puts a
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puts a.class
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end
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end
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Example_Class.new
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```
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### mrb_hash_set
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```C
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#include <stdio.h>
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#include <mruby.h>
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#include "mruby/hash.h" // Needs the hash header.
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#include "mruby/compile.h"
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int main(int argc, char *argv[])
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{
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mrb_state *mrb = mrb_open();
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if (!mrb) { /* handle error */ }
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mrb_value new_hash; // Declare variable.
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mrb_sym hash_key = mrb_intern_cstr(mrb, "da_key"); // Declare a symbol.
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mrb_int hash_value = 80; // Declare a fixnum value.
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FILE *fp = fopen("test_ext.rb","r");
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new_hash = mrb_hash_new(mrb); // Initialize hash.
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mrb_value obj = mrb_load_file(mrb,fp);
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mrb_hash_set(mrb, new_hash, mrb_symbol_value(hash_key), mrb_fixnum_value(hash_value)); // Set values to hash.
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mrb_funcall(mrb, obj, "method_name", 1, new_hash);
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fclose(fp);
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mrb_close(mrb);
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return 0;
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}
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```
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#### test_ext.rb
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```Ruby
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class Example_Class
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def method_name(a)
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puts a
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puts a.class
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end
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end
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Example_Class.new
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```
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#### Result
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After compiling you should get these results.
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```Ruby
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{:da_key=>80}
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Hash
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```
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