module_eval(...)
public
Evaluates the string or block in the context of mod. This can be
used to add methods to a class. module_eval returns the result of
evaluating its argument. The optional filename and lineno
parameters set the text for error messages.
class Thing
end
a = %q{def hello() "Hello there!" end}
Thing.module_eval(a)
puts Thing.new.hello()
Thing.module_eval("invalid code", "dummy", 123)
produces:
Hello there!
dummy:123:in `module_eval': undefined local variable
or method `code' for Thing:Class
Show source
/*
* call-seq:
* mod.class_eval(string [, filename [, lineno]]) => obj
* mod.module_eval {|| block } => obj
*
* Evaluates the string or block in the context of _mod_. This can
* be used to add methods to a class. <code>module_eval</code> returns
* the result of evaluating its argument. The optional _filename_
* and _lineno_ parameters set the text for error messages.
*
* class Thing
* end
* a = %q{def hello() "Hello there!" end}
* Thing.module_eval(a)
* puts Thing.new.hello()
* Thing.module_eval("invalid code", "dummy", 123)
*
* <em>produces:</em>
*
* Hello there!
* dummy:123:in `module_eval': undefined local variable
* or method `code' for Thing:Class
*/
VALUE
rb_mod_module_eval(argc, argv, mod)
int argc;
VALUE *argv;
VALUE mod;
{
return specific_eval(argc, argv, mod, mod);
}