Boolean values: Difference between revisions
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* Any class reference type, using the "is" operator, the null reference gives false and any other reference gives true; |
* Any class reference type, using the "is" operator, the null reference gives false and any other reference gives true; |
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* Any user-defined type with an implicit conversion operator (opCast) either to bool or to a built-in type which itself can be converted to bool. |
* Any user-defined type with an implicit conversion operator (opCast) either to bool or to a built-in type which itself can be converted to bool. |
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=={{header|Dc}}== |
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In dc there are no built in boolean values or functions. |
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Adopting the way C codes them appears to be a good idea: <code>0=FALSE</code> and <code>1=TRUE</code>. |
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=={{header|Delphi}}== |
=={{header|Delphi}}== |
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