xctocc Types

 

These basic types are as in C++:

• int  
• short  
• long  
• unsigned  
• float  
• double  

These type as similar to C++ types, with extended Scheme meaning:

• char   -- a character in Scheme
• byte   -- like a C++ char, but a number in Scheme
• Long   -- forced to be an integer from Scheme (i.e. the parameter cannot be an inexact number)
• Double   -- forced to be a floating-point number from Scheme (i.e. the parameter cannot be an exact integer)
• string   -- a null-terminated string; char * in C++
• nstring   -- a null-terminated string or NULL; char * in C++
• cstring   -- a constant string; const char * in C++
• ncstring   -- a constant string or NULL; const char * in C++
• ustring   -- a null-terminated string; unsigned char * in C++
• nustring   -- a null-terminated string or NULL; unsigned char * in C++
• custring   -- a constant string; const unsigned char * in C++
• ncustring   -- a constant string or NULL; const unsigned char * in C++
• bool   -- a boolean in Scheme; the C++ representation must be specified with @BOOLEAN

When a type is followed by *  , then the type is interepreted as a modifiable (single) indirect value.

When a type is followed by ?  , then the type is interepreted as a modifiable indirect value or a NULL pointer.

When a type is followed by &  , then the type is interpreted as call-by-reference (or return-by-reference).

When a type is followed by []  , then the type is interpreted as an array; the value must be manually bundled and unbundled with macros.

    A class name can be used, followed by either !, , or %  . ! indicates a pointer to an object, indicates a possibly NULL pointer, and % indicates a object passed by reference.

Any other valid C++ type can be used, but the value must be manually bundled and unbundled with macros.

An xctocc type is translated appropriately in the C++ glue code. For example, Long? becomes long * and MyClass% becomes MyClass&.