In Files

  • prec.c

Precision

Precision is a mixin for concrete numeric classes with precision. Here, `precision' means the fineness of approximation of a real number, so, this module should not be included into anything which is not a subset of Real (so it should not be included in classes such as Complex or Matrix).

Public Class Methods

included(p1) click to toggle source

call_seq:

included

When the Precision module is mixed-in to a class, this included method is used to add our default induced_from implementation to the host class.

 
               static VALUE
prec_included(module, include)
    VALUE module, include;
{
    switch (TYPE(include)) {
      case T_CLASS:
      case T_MODULE:
       break;
      default:
       Check_Type(include, T_CLASS);
       break;
    }
    rb_define_singleton_method(include, "induced_from", prec_induced_from, 1);
    return module;
}
            

Public Instance Methods

prec(klass) => a_klass click to toggle source

Converts self into an instance of klass. By default, prec invokes

klass.induced_from(num)

and returns its value. So, if klass.induced_from doesn’t return an instance of klass, it will be necessary to reimplement prec.

 
               static VALUE
prec_prec(x, klass)
    VALUE x, klass;
{
    return rb_funcall(klass, prc_if, 1, x);
}
            
prec_f => Float click to toggle source

Returns a Float converted from num. It is equivalent to prec(Float).

 
               static VALUE
prec_prec_f(x)
    VALUE x;
{
    VALUE klass = rb_cFloat;

    return rb_funcall(x, prc_pr, 1, klass);
}
            
prec_i => Integer click to toggle source

Returns an Integer converted from num. It is equivalent to prec(Integer).

 
               static VALUE
prec_prec_i(x)
    VALUE x;
{
    VALUE klass = rb_cInteger;

    return rb_funcall(x, prc_pr, 1, klass);
}