41 lines
1.2 KiB
Factor
Executable File
41 lines
1.2 KiB
Factor
Executable File
! Copyright (C) 2008 Slava Pestov.
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! See http://factorcode.org/license.txt for BSD license.
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USING: accessors alien alien.c-types byte-arrays kernel libc
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math sequences sequences.private ;
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IN: struct-arrays
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TUPLE: struct-array
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{ underlying c-ptr read-only }
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{ length array-capacity read-only }
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{ element-size array-capacity read-only } ;
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M: struct-array length length>> ;
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M: struct-array nth-unsafe
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[ element-size>> * ] [ underlying>> ] bi <displaced-alien> ;
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M: struct-array set-nth-unsafe
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[ nth-unsafe swap ] [ element-size>> ] bi memcpy ;
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M: struct-array new-sequence
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element-size>> [ * <byte-array> ] 2keep struct-array boa ; inline
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: <struct-array> ( length c-type -- struct-array )
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heap-size [ * <byte-array> ] 2keep struct-array boa ; inline
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ERROR: bad-byte-array-length byte-array ;
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: byte-array>struct-array ( byte-array c-type -- struct-array )
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heap-size [
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[ dup length ] dip /mod 0 =
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[ drop bad-byte-array-length ] unless
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] keep struct-array boa ; inline
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: <direct-struct-array> ( alien length c-type -- struct-array )
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heap-size struct-array boa ; inline
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: malloc-struct-array ( length c-type -- struct-array )
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[ heap-size calloc ] 2keep <direct-struct-array> ; inline
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INSTANCE: struct-array sequence
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