class DL::CUnionEntity
A C union wrapper
Public Class Methods
malloc(types, func=nil)
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Allocates a C union the types
provided. The C function
func
is called when the instance is garbage collected.
# File ext/dl/lib/dl/struct.rb, line 212 def CUnionEntity.malloc(types, func=nil) addr = DL.malloc(CUnionEntity.size(types)) CUnionEntity.new(addr, types, func) end
size(types)
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Given types
, returns the size needed for the union.
DL::CUnionEntity.size([DL::TYPE_DOUBLE, DL::TYPE_INT, DL::TYPE_CHAR, DL::TYPE_VOIDP]) => 8
# File ext/dl/lib/dl/struct.rb, line 222 def CUnionEntity.size(types) types.map { |type, count = 1| PackInfo::SIZE_MAP[type] * count }.max end
Public Instance Methods
set_ctypes(types)
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Given types
, calculate the necessary offset and for each union
member
# File ext/dl/lib/dl/struct.rb, line 229 def set_ctypes(types) @ctypes = types @offset = Array.new(types.length, 0) @size = self.class.size types end