Ruby Pointer.malloc用法及代碼示例

Fiddle::Pointer.malloc(size, freefunc = nil) → fiddle pointer instance

Fiddle::Pointer.malloc(size, freefunc) { |pointer| ... } → ...

例子

# Automatically freeing the pointer when the block is exited - recommended
Fiddle::Pointer.malloc(size, Fiddle::RUBY_FREE) do |pointer|
  ...
end

# Manually freeing but relying on the garbage collector otherwise
pointer = Fiddle::Pointer.malloc(size, Fiddle::RUBY_FREE)
...
pointer.call_free

# Relying on the garbage collector - may lead to unlimited memory allocated before freeing any, but safe
pointer = Fiddle::Pointer.malloc(size, Fiddle::RUBY_FREE)
...

# Only manually freeing
pointer = Fiddle::Pointer.malloc(size)
begin
  ...
ensure
  Fiddle.free pointer
end

# No free function and no call to free - the native memory will leak if the pointer is garbage collected
pointer = Fiddle::Pointer.malloc(size)
...

分配 size 字節的內存並將其與可選的 freefunc 相關聯。

如果提供了一個塊，則指針將被屈服於該塊而不是被返回，並且該塊的返回值將被返回。如果有塊，則必須提供 freefunc。

如果提供了 freefunc ，它將被調用一次，當指針被垃圾收集時，或者如果提供了塊，或者當用戶調用 call_free 時，以先發生者為準。 freefunc 必須是指向 Fiddle::Function 的函數或實例的地址。