Ruby Pointer.malloc用法及代码示例

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 字节的内存并将其与可选的 freefunc 相关联。

如果提供了一个块，则指针将被屈服于该块而不是被返回，并且该块的返回值将被返回。如果有块，则必须提供 freefunc。

如果提供了 freefunc ，它将被调用一次，当指针被垃圾收集时，或者如果提供了块，或者当用户调用 call_free 时，以先发生者为准。 freefunc 必须是指向 Fiddle::Function 的函数或实例的地址。