The keyword hyper indicates a 64-bit integer that can be declared as either signed or unsigned.
[ signed | unsigned ] hyper [ int ] declarator-list;
Specifies one or more standard C declarators, such as identifiers, pointer declarators, and array declarators. (Function declarators and bit-field declarations are not allowed in structures that are transmitted in remote procedure calls. These declarators are allowed in structures that are not transmitted.) Separate multiple declarators with commas.
The hyper type is one of the base types of the interface definition language (IDL). The hyper type can appear as a type specifier in const declarations, typedef declarations, general declarations, and function declarators (as a function-return-type specifier and as a parameter-type specifier). For the context in which type specifiers appear, see Interface Definition (IDL) File.
Note For 16-bit platforms, the MIDL compiler replaces unsigned hyper integers with MIDL_uhyper. This allows interfaces with unsigned hyper integers to be defined on platforms that do not directly support 64-bit integers. MIDL_uhyper is defined in the RPC header files.