method

class_variable_defined?

ruby latest stable - Class: Module

class_variable_defined?(p1)

public

Returns true if the given class variable is defined in obj. String arguments are converted to symbols.

class Fred
  @@foo = 99
end
Fred.class_variable_defined?(:@@foo)    #=> true
Fred.class_variable_defined?(:@@bar)    #=> false

static VALUE
rb_mod_cvar_defined(VALUE obj, VALUE iv)
{
    ID id = id_for_var(obj, iv, a, class);

    if (!id) {
        return Qfalse;
    }
    return rb_cvar_defined(obj, id);
}

class_variable_defined?

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