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2.3.6 Complex Types

‘libffi’ supports the complex types defined by the C99 standard (_Complex float, _Complex double and _Complex long double with the built-in type descriptors ffi_type_complex_float, ffi_type_complex_double and ffi_type_complex_longdouble.

Custom complex types like _Complex int can also be used. An ffi_type object has to be defined to describe the complex type to ‘libffi’.

Data type: ffi_type ¶

size_t size

This must be manually set to the size of the complex type.

unsigned short alignment

This must be manually set to the alignment of the complex type.

unsigned short type

For a complex type, this must be set to FFI_TYPE_COMPLEX.

ffi_type **elements

This is a ‘NULL’-terminated array of pointers to ffi_type objects. The first element is set to the ffi_type of the complex’s base type. The second element must be set to NULL.

The section Complex Type Example shows a way to determine the size and alignment members in a platform independent way.

For platforms that have no complex support in libffi yet, the functions ffi_prep_cif and ffi_prep_args abort the program if they encounter a complex type.