52 lines
2.6 KiB
Factor
52 lines
2.6 KiB
Factor
IN: struct-arrays
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USING: classes.struct help.markup help.syntax alien strings math multiline ;
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HELP: struct-array
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{ $class-description "The class of C struct and union arrays."
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$nl
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"The " { $slot "underlying" } " slot holds a " { $link c-ptr } " with the raw data. This pointer can be passed to C functions." } ;
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HELP: <struct-array>
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{ $values { "length" integer } { "struct-class" struct-class } { "struct-array" struct-array } }
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{ $description "Creates a new array for holding values of the specified struct type." } ;
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HELP: <direct-struct-array>
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{ $values { "alien" c-ptr } { "length" integer } { "struct-class" struct-class } { "struct-array" struct-array } }
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{ $description "Creates a new array for holding values of the specified C type, backed by the memory at " { $snippet "alien" } "." } ;
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HELP: struct-array-on
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{ $values { "struct" struct } { "length" integer } { "struct-array" struct-array } }
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{ $description "Create a new array for holding values of " { $snippet "struct" } "'s C type, backed by the memory starting at " { $snippet "struct" } "'s address." }
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{ $examples
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"This word is useful with the FFI. When a C function has a pointer to a struct as its return type (or a C callback has a struct pointer as an argument type), Factor automatically wraps the pointer in a " { $link struct } " object. If the pointer actually references an array of objects, this word will convert the struct object to a struct array object:"
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{ $code <" USING: alien.syntax classes.struct struct-arrays ;
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IN: scratchpad
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STRUCT: zim { zang int } { zung int } ;
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FUNCTION: zim* zingle ( ) ; ! Returns a pointer to 20 zims
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zingle 20 struct-array-on "> }
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} ;
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HELP: struct-array{
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{ $syntax "struct-array{ class value value value ... }" }
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{ $description "Literal syntax for a " { $link struct-array } " containing structs of the given " { $link struct } " class." } ;
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HELP: struct-array@
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{ $syntax "struct-array@ class alien length" }
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{ $description "Literal syntax for a " { $link struct-array } " at a particular memory address. The prettyprinter uses this syntax when the memory backing a struct array object is invalid. This syntax should not generally be used in source code." } ;
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{ POSTPONE: struct-array{ POSTPONE: struct-array@ } related-words
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ARTICLE: "struct-arrays" "C struct and union arrays"
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"The " { $vocab-link "struct-arrays" } " vocabulary implements arrays specialized for holding C struct and union values."
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{ $subsection struct-array }
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{ $subsection <struct-array> }
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{ $subsection <direct-struct-array> }
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{ $subsection struct-array-on }
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"Struct arrays have literal syntax:"
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{ $subsection POSTPONE: struct-array{ } ;
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ABOUT: "struct-arrays"
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