Databases
StackOverflow2013
Postsdbo
POpointer being freed was not allocated for pointer assignment
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POpointer being freed was not allocated for pointer assignment
    primarykey
    data
    text
    <p>I was trying to change a ListNode struct into a class format but am running into some issues when testing it.</p> <p>Getting a.out(7016) malloc: <strong>* error for object 0x7fff65333b10: pointer being freed was not allocated *</strong> set a breakpoint in malloc_error_break to debug</p> <pre><code>chainLink.hpp #ifndef CHAINLINK_H #define CHAINLINK_H using namespace std; #include &lt;iostream&gt; #include &lt;cstdlib&gt; template &lt;typename Object&gt; class chainLink { private: Object storedValue; chainLink *nextLink; public: //Constructor chainLink(const Object &amp;value = Object()): storedValue(value) { nextLink = NULL; } /* Postcondition: returns storedValue; */ Object getValue() { return storedValue; } /* Postcondition: sets storedValue = value */ void setValue(Object &amp;value) { storedValue = value; } /* Postcondition: sets nextLink to &amp;value */ void setNextLink(chainLink* next) { nextLink = next; } chainLink* getNext() { return nextLink; } ~chainLink() { delete nextLink; } }; #endif </code></pre> <p>My test file, assume includes</p> <pre><code>int main() { chainLink&lt;int&gt; x(1); cout &lt;&lt; "X: " &lt;&lt; x.getValue() &lt;&lt; " "&lt;&lt; endl; chainLink&lt;int&gt; y(2); cout &lt;&lt; "Y: " &lt;&lt; y.getValue() &lt;&lt; " "&lt;&lt; endl; chainLink&lt;int&gt;* z = &amp;y; cout &lt;&lt; &amp;y &lt;&lt; " " &lt;&lt; z &lt;&lt; endl; x.setNextLink(z); } </code></pre> <p>OUTPUT: X: 1 Y: 2 0x7fff65333b10 0x7fff65333b10 a.out(7016) malloc: <strong>* error for object 0x7fff65333b10: pointer being freed was not allocated *</strong> set a breakpoint in malloc_error_break to debug Abort trap: 6</p> <p>The error seems to be thrown by the setNextLink function.</p> <p>Any help greatly appreciated.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USStals
    1. USuser1645240
    plurals
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POpointer being freed was not allocated for pointer assignment
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    2. VO
      singulars
      1. POpointer being freed was not allocated for pointer assignment
      1. This table or related slice is empty.
      1. VTUpMod
    1. COIt helps if you try to read and understand what the error message is telling you: "pointer being freed **was not allocated**." That probably means you forgot to allocate something, like say a `new` somewhere. Every `delete` call must be preceded by a `new` call somewhere (which may or may not be somewhere outside your code).
      singulars
      1. POpointer being freed was not allocated for pointer assignment
      1. USIn silico
    2. CODid you get the `z`pointer from a call to new?
      singulars
      1. POpointer being freed was not allocated for pointer assignment
      1. USMat
    3. CONot strictly related, but what do you mean by changing something "from struct to a class format"?
      singulars
      1. POpointer being freed was not allocated for pointer assignment
      1. USjalf
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload