Evaluate a "or" value lazily.#11
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Sometime we want to evaluate a value of "or"'s parameter. For example, the value should be a newly created object, but if Nothing.or(...) is called, we don't want to create the object. Because the current implemented "or" method is not lazily evaluated, we have to use "if-then" statement in such a case. In scala, a parameter of the "orElse" method is evaluated lazily. This commit contains a new method "or_lazy" which evaluate the value lazily.
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Sometime we want to evaluate a value of "or"'s parameter. For example,
the value should be a newly created object, but if Nothing.or(...) is
called, we don't want to create the object.
Because the current implemented "or" method is not lazily evaluated, we
have to use "if-then" statement in such a case.
In scala, a parameter of the "orElse" method is evaluated lazily. This
commit contains a new method "or_lazy" which evaluate the value lazily.