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Since we have to query the parameter to determine it's status, the isvalid(), isundefined() and isnotanumber() methods now call query(). This implies that the methods had to be passed non-const, as query() modifies the members of the parameter.
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The parameter validity is checked before returning a value. This ensures that invalid values are not inadvertedly passed to the executable. The isvalid() method can be used to ensure that a parameter is valid before accessing it.
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A parameter status member has been added that allows a parameter to be undefined or nan.
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All classes our now derived from GBase. For this we had to define and to implement the clear() method for all classes. ostream and GLog friends have also been removed, as they are no implemented at the GBase level.
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The change has been performed to try avoiding a cppcheck error. The code was also reviewed for compliance.
