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Precision
Precision is a Mix-in for concrete numerical classes
with precision.
Here, `precision' means the fineness of approximation of a real number,
so, this module should not be included into non-subset of real,
e.g. abstract numerical, complex, matrix.
Class Methods:
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induced_from(number)
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Creates an ojbect which is converted from number .
Since it raise TypeError in default, redefine before uses.
Note that a use of prec in a redefinition
may causes an infinite loop.
Method:
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prec(klass)
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Converts self into a object of klass.
In default, prec invokes
klass.induced_from(self)
and returns its value. So, if klass.induced_from
doesn't correspond to the class of self, it is neccessary to redefine
this prec .
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prec_i
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Returns an integer converted from self .
It is equivalent to
prec(Integer) .
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prec_f
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Returns a floating-point number converted from self .
It is equivalent to
prec(Float) .
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matz@netlab.co.jp
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