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Top Forums Programming *** glibc detected *** double free or corruption: 0x40236ff4 *** Post 302196146 by g2wang on Friday 16th of May 2008 07:57:49 PM
Old 05-16-2008
Use reference in your member function

The problem seems to be your member function definition:
MyStack operator + (MyStack);
It should use a reference of MyStack as the argument as follows:
MyStack operator + (MyStack&);
Without the &, a copy of MyStack object is made and it contains a pointer to the private data member T* stackPtr. When the copy of the MyStack goes out of scope in the member function, the destructor of the MyStack object copy is called and the stackPtr is deleted. This also deletes the stackPtr of the original object because your class does not define a copy constructor to make a deep copy of the stackPtr. Then when your original object's destructor is called later, it does "delete [] stackPtr" again on an already deleted pointer. Thus the error appears.
 

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local(n)							    [incr Tcl]								  local(n)

__________________________________________________________________________________________________________________________________________________

NAME
local - create an object local to a procedure SYNOPSIS
itcl::local className objName ?arg arg ...? _________________________________________________________________ DESCRIPTION
The local command creates an [incr Tcl] object that is local to the current call frame. When the call frame goes away, the object is auto- matically deleted. This command is useful for creating objects that are local to a procedure. As a side effect, this command creates a variable named "itcl-local-xxx", where xxx is the name of the object that is created. This vari- able detects when the call frame is destroyed and automatically deletes the associated object. EXAMPLE
In the following example, a simple "counter" object is used within the procedure "test". The counter is created as a local object, so it is automatically deleted each time the procedure exits. The puts statements included in the constructor/destructor show the object coming and going as the procedure is called. itcl::class counter { private variable count 0 constructor {} { puts "created: $this" } destructor { puts "deleted: $this" } method bump {{by 1}} { incr count $by } method get {} { return $count } } proc test {val} { local counter x for {set i 0} {$i < $val} {incr i} { x bump } return [x get] } set result [test 5] puts "test: $result" set result [test 10] puts "test: $result" puts "objects: [itcl::find objects *]" KEYWORDS
class, object, procedure itcl local(n)
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