Class: Fiddle::CUnionEntity
- Inherits:
-
CStructEntity
- Object
- Pointer
- CStructEntity
- Fiddle::CUnionEntity
- Includes:
- PackInfo
- Defined in:
- lib/fiddle/struct.rb
Overview
A C union wrapper
Constant Summary
Constants included from PackInfo
PackInfo::ALIGN_MAP, PackInfo::PACK_MAP, PackInfo::SIZE_MAP
Class Method Summary collapse
-
.malloc(types, func = nil) ⇒ Object
Allocates a C union the
types
provided. -
.size(types) ⇒ Object
Returns the size needed for the union with the given
types
.
Instance Method Summary collapse
-
#set_ctypes(types) ⇒ Object
Calculate the necessary offset and for each union member with the given
types
.
Methods included from PackInfo
Methods inherited from CStructEntity
#[], #[]=, #assign_names, #initialize, #to_s
Methods included from ValueUtil
#signed_value, #unsigned_value, #wrap_arg, #wrap_args
Methods inherited from Pointer
#+, #+@, #-, #-@, #<=>, #==, [], #[], #[]=, #eql?, #free, #free=, #initialize, #inspect, #null?, #ptr, #ref, #size, #size=, #to_i, #to_int, to_ptr, #to_s, #to_str, #to_value
Constructor Details
This class inherits a constructor from Fiddle::CStructEntity
Class Method Details
.malloc(types, func = nil) ⇒ Object
Allocates a C union the types
provided.
When the instance is garbage collected, the C function func
is called.
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# File 'lib/fiddle/struct.rb', line 216 def CUnionEntity.malloc(types, func=nil) addr = Fiddle.malloc(CUnionEntity.size(types)) CUnionEntity.new(addr, types, func) end |
.size(types) ⇒ Object
Returns the size needed for the union with the given types
.
Fiddle::CUnionEntity.size(
[ Fiddle::TYPE_DOUBLE,
Fiddle::TYPE_INT,
Fiddle::TYPE_CHAR,
Fiddle::TYPE_VOIDP ]) #=> 8
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# File 'lib/fiddle/struct.rb', line 228 def CUnionEntity.size(types) types.map { |type, count = 1| PackInfo::SIZE_MAP[type] * count }.max end |
Instance Method Details
#set_ctypes(types) ⇒ Object
Calculate the necessary offset and for each union member with the given types
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# File 'lib/fiddle/struct.rb', line 236 def set_ctypes(types) @ctypes = types @offset = Array.new(types.length, 0) @size = self.class.size types end |