Documentation for Ice 3.4. The latest release is Ice 3.7. Refer to the space directory for other releases.

A Slice class definition is similar to a structure definition, but uses the class keyword. For example:

class TimeOfDay {
    short hour;         // 0 - 23
    short minute;       // 0 - 59
    short second;       // 0 - 59

Apart from the keyword class, this definition is identical to the structure example. You can use a Slice class wherever you can use a Slice structure (but, as we will see shortly, for performance reasons, you should not use a class where a structure is sufficient). Unlike structures, classes can be empty:

class EmptyClass {};    // OK
struct EmptyStruct {};  // Error

Much the same design considerations as for empty interfaces apply to empty classes: you should at least stop and rethink your approach before committing yourself to an empty class.

You can specify a default value for a class data member that has one of the following types:

For example:

class Location {
    string name;
    Point pt;
    bool display = true;
    string source = "GPS";

The legal syntax for literal values is the same as for Slice constants, and you may also use a constant as a default value. The language mapping guarantees that data members are initialized to their declared default values using a language-specific mechanism.

See Also
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