Create an object at a given address: Difference between revisions
Create an object at a given address (view source)
Revision as of 23:15, 17 October 2016
, 7 years agoAdded FreeBASIC
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</lang>
Some architectures may require special fetch and store operators to access ports. For example, [[Open Firmware]] defines l@ and l! for safe 32-bit port writes.
=={{header|FreeBASIC}}==
<lang freebasic>' FB 1.05.0
Type Person
As String name
As Integer age
Declare Constructor(name As String, age As Integer)
End Type
Constructor Person(name As String, age As Integer)
This.name = name
This.age = age
End Constructor
Dim ap As Any Ptr = CAllocate(SizeOf(Person)) ' allocate memory to store a Person object
'create a Person object at the address of the memory we've just allocated
Dim p As Person Ptr = New(ap) Person("Teresa", 60)
'check addresses are same
Print ap, p
'check data is not corrupt
Print p -> name, p -> age
'call implicit destructor
p -> Destructor
'free memory
Deallocate(ap)
Print
Print "Press any key to quit"
Sleep</lang>
{{out}}
<pre>
4790800 4790800
Teresa 60
</pre>
=={{header|Go}}==
Go has several ways to access arbitrary memory locations using the built-in unsafe package. If the desired memory contains an array, since Go doesn't have pointer arithmetic, then a slice should be used instead of a pointer. The following solution demonstrates both a pointer and a slice.
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