<h1>USER</h1>

<p>Panics with this category are raised on the user side by member functions

of T type and R type classes which reside in <code class="filename">euser.dll</code>.</p>

<p>They are also raised by some static member functions of the

<code>User</code>, <code>UserHeap</code> and <code>RHeap</code> classes.

Typically, they are caused by passing bad or contradictory values to class

constructors or member functions.</p>

<p>

The thread causing the panic is terminated. 

</p>

<code>0</code>

<p>

This panic is raised when a thread calls

<a href="../reference-cpp/E32_EKA2/UserClass.html#%3a%3aUser" title="class User"><code class="ApiItem">User</code></a><code>::Invariant()</code>. 

</p>

<p>

Typically, <code>User::Invariant()</code> is called when a test for

a class invariant fails, i.e. when a test which checks that the internal data

of an object is self-consistent, fails. </p>

<p>

Check the design and implementation of your class. 

</p>

<code>3</code>

<p>

This panic is raised when a <a href="../reference-cpp/E32_EKA2/TDateTimeClass.html#%3a%3aTDateTime" title="class TDateTime"><code class="ApiItem">TDateTime</code></a> object

is constructed with an invalid date or time field. 

</p>

<code>7</code>

<p>

This panic is raised by the <code>Ptr()</code> member function of a

16-bit variant descriptor if the descriptor is invalid. 

</p>

<p>

Check for ways in which the descriptor may have become corrupted,

including an unsafe use of cast. 

</p>

<code>8</code>

<p>

This panic is raised when a length value passed to a 16-bit variant

descriptor member function is invalid. It may be raised by some descriptor

constructors and, specifically, by the <code>Replace()</code> and

<code>Set()</code> descriptor member functions. 

</p>

<code>9</code>

<p>

This panic is raised when the index value passed to the 16-bit

variant descriptor <code>Operator[]</code> is out of bounds 

</p>

<code>10</code>

<p>

This panic is raised when the position value passed to a 16-bit

variant descriptor member function is out of bounds. It may be raised by the

<code>Left()</code>, <code>Right()</code>, <code>Mid()</code>,

<code>Insert()</code>, <code>Delete()</code> and <code>Replace()</code> member

functions of <a href="../reference-cpp/E32_EKA2/TDes16Class.html#%3a%3aTDes16" title="class TDes16"><code class="ApiItem">TDes16</code></a>. 

</p>

<code>11</code>

<p>

This panic is raised when any operation that moves or copies data

to a 16-bit variant descriptor, causes the length of that descriptor to exceed

its maximum length. 

</p>

<p>

It may be caused by any of the copying, appending or formatting

member functions and, specifically, by the <code>Insert()</code>,

<code>Replace()</code>, <code>Fill()</code>, <code>Fillz()</code> and

<code>ZeroTerminate()</code> descriptor member functions. It can also be caused

by the <code>SetLength()</code> function. See <a href="../reference-cpp/E32_EKA2/TDes16Class.html#%3a%3aTDes16" title="class TDes16"><code class="ApiItem">TDes16</code></a>. 

</p>

<code>12</code>

<p>

This panic is raised when the format string passed to the 16-bit

variant descriptor member functions <code>Format()</code> and

<code>AppendFormat()</code> has invalid syntax. 

</p>

<p>

See <a href="../reference-cpp/E32_EKA2/TDes16Class.html#%3a%3aTDes16%3a%3aFormat%28%29" title="function TDes16::Format()"><code class="ApiItem">TDes16::Format()</code></a> and

<a href="../reference-cpp/E32_EKA2/TDes16Class.html#%3a%3aTDes16%3a%3aAppendFormat%28%29" title="function TDes16::AppendFormat()"><code class="ApiItem">TDes16::AppendFormat()</code></a>. 

</p>

<code>13</code>

<p>

<em>This panic is raised in debug builds only.</em>

</p>

<p>

It is raised by the <code>AppendFormatList()</code> member function

of the 16-bit variant descriptor <a href="../reference-cpp/E32_EKA2/TDes16Class.html#%3a%3aTDes16" title="class TDes16"><code class="ApiItem">TDes16</code></a>, if an invalid

variable list is passed to the function when the format is <code>%S</code> or <code>%s</code>. 

</p>

<code>14</code>

<p>

This panic is raised when expanding or contracting an

<a href="../reference-cpp/E32_EKA2/HBufC16Class.html#%3a%3aHBufC16" title="class HBufC16"><code class="ApiItem">HBufC16</code></a> buffer using the <code>ReAlloc()</code> or

<code>ReAllocL()</code> descriptor member functions. Specifically, the panic

occurs if the new length being specified is too small to contain the data. 

</p>

<code>16</code>

<p>

This panic is raised by the <code>Replace()</code> member function

of the 16-bit variant descriptor <a href="../reference-cpp/E32_EKA2/TDes16Class.html#%3a%3aTDes16" title="class TDes16"><code class="ApiItem">TDes16</code></a> when the length of

the source descriptor is negative or exceeds the maximum length of the target

descriptor. 

</p>

<code>17</code>

<p>

This panic is raised when 16-bit variant descriptors are

constructed with negative length values. It may also be raised if the

<code>Set()</code>, <code>Repeat()</code> and the <code>Find()</code> member

functions are passed negative length values. 

</p>

<code>18</code>

<p>

This panic is raised when 16-bit variant descriptors are

constructed with negative maximum length values. 

</p>

<code>19</code>

<p>

This panic is raised by the <code>Ptr()</code> member function of

an 8 bit variant descriptor if the descriptor is invalid. Check for ways in

which the descriptor may have become corrupted, including an unsafe use of

cast. 

</p>

<code>20</code>

<p>

This panic is raised when a length value passed to an 8 bit variant

descriptor member function is invalid. It may be raised by some descriptor

constructors and, specifically, by the <code>Replace()</code> and

<code>Set()</code> descriptor member functions. 

</p>

<code>21</code>

<p>

This panic is raised when the index value passed to the 8 bit

variant descriptor <code>Operator[]</code> is out of bounds. 

</p>

<code>22</code>

<p>

This panic is raised when the position value passed to an 8 bit

variant descriptor member function is out of bounds. It may be raised by the

<code>Left()</code>, <code>Right()</code>, <code>Mid()

</code>,

<code>Insert()</code>, <code>Delete()</code> and <code>Replace()

</code>

descriptor member functions. 

</p>

<code>23</code>

<p>

This panic is raised when any operation that moves or copies data

to an 8 bit variant descriptor, causes the length of that descriptor to exceed

its maximum length. 

</p>

<p>

It may be caused by any of the copying, appending or formatting

member functions and, specifically, by the <code>Insert()</code>,

<code>Replace()</code>, <code>Fill()</code>, <code>Fillz()</code> and

<code>ZeroTerminate()</code> descriptor member functions. It can also be caused

by the <code>SetLength()</code> function. See <a href="../reference-cpp/E32_EKA2/TDes8Class.html#%3a%3aTDes8" title="class TDes8"><code class="ApiItem">TDes8</code></a>. 

</p>

<code>24</code>

<p>

This panic is raised when the format string passed to the 8 bit

variant descriptor member functions <code>Format()</code> and

<code>AppendFormat()</code> has invalid syntax. 

</p>

<p>

See <a href="../reference-cpp/E32_EKA2/TDes8Class.html#%3a%3aTDes8%3a%3aFormat%28%29" title="function TDes8::Format()"><code class="ApiItem">TDes8::Format()</code></a> and

<a href="../reference-cpp/E32_EKA2/TDes8Class.html#%3a%3aTDes8%3a%3aAppendFormat%28%29" title="function TDes8::AppendFormat()"><code class="ApiItem">TDes8::AppendFormat()</code></a>. 

</p>

<code>25</code>

<p>

<em>This panic is raised in debug builds only.</em>

</p>

<p>

This panic is raised by the <code>AppendFormatList()</code> member

function of the 8-bit variant descriptor <a href="../reference-cpp/E32_EKA2/TDes8Class.html#%3a%3aTDes8" title="class TDes8"><code class="ApiItem">TDes8</code></a>, if an

invalid variable list is passed to the function when the format is

<code>%S</code> or <code>%s</code>. 

</p>

<code>26</code>

<p>

This panic is raised when expanding or contracting an

<a href="../reference-cpp/E32_EKA2/HBufC8Class.html#%3a%3aHBufC8" title="class HBufC8"><code class="ApiItem">HBufC8</code></a> buffer using the <code>ReAlloc()</code> or

<code>ReAllocL()</code> descriptor member functions. Specifically, the panic

occurs if the new length being specified is too small to contain the data. 

</p>

<code>28</code>

<p>

This panic is raised by the <code>Replace()</code> member function

of the 8-bit variant descriptor <a href="../reference-cpp/E32_EKA2/TDes8Class.html#%3a%3aTDes8" title="class TDes8"><code class="ApiItem">TDes8</code></a>, when the length of

the source descriptor is negative or exceeds the maximum length of the target

descriptor. 

</p>

<code>29</code>

<p>

This panic is raised when 8-bit variant descriptors are constructed

with negative length values. It may also be raised if the <code>Set()</code>,

<code>Repeat()</code> and the <code>Find()</code> member functions are passed

negative length values. 

</p>

<code>30</code>

<p>

This panic is raised when 8-bit variant descriptors are constructed

with negative maximum length values. 

</p>

<code>32</code>

<p>

<em>This panic is raised in debug builds only.</em>

</p>

<p>

It is raised by the <code>Pos()</code> member function of a

<code>TRawEvent</code>. The function returns the mouse/pen position

encapsulated by the <code>TRawEvent</code>. The panic is raised when the event

is not a mouse/pen type event. 

</p>

<code>33</code>

<p>

<em>This panic is raised in debug builds only.</em>

</p>

<p>

It is raised by the <code>ScanCode()</code> member function of a

<code>TRawEvent</code>. The function returns the scan code associated with a

key down or key up event encapsulated by the <code>TRawEvent</code>. The panic

is raised when the event is not a key down or key up event. 

</p>

<code>34</code>

<p>

<em>This panic is raised in debug builds only.</em>

</p>

<p>

It is raised by the <code>Modifiers()</code> member function of a

<code>TRawEvent</code>. The function returns the modifers associated with a

modifiers update event encapsulated by the <code>TRawEvent</code>. The panic is

raised when the event is not a modifier update event. 

</p>

<code>35</code>

<p>

This panic is raised by the default <code>At()</code> virtual

member function of <a href="../reference-cpp/E32_EKA2/TKeyClass.html#%3a%3aTKey" title="class TKey"><code class="ApiItem">TKey</code></a>. The function is intended to be

overridden by a derived class. 

</p>

<code>36</code>

<p>

This panic is raised by the default <code>Swap()</code> virtual

member function of <a href="../reference-cpp/E32_EKA2/TSwapClass.html#%3a%3aTSwap" title="class TSwap"><code class="ApiItem">TSwap</code></a>. The function is intended to be

overridden by a derived class. 

</p>

<code>37</code>

<p>

This panic is raised by the <code>operator[]</code> of a

<a href="../reference-cpp/E32_EKA2/TUidTypeClass.html#%3a%3aTUidType" title="class TUidType"><code class="ApiItem">TUidType</code></a> when the index value passed to the operator is

either negative or is greater than or equal to the constant

<code>KMaxCheckedUid</code> defined in <code class="filename">e32const.h</code>. 

</p>

<code>38</code>

<p>

This panic is raised by the <code>Set(TDesC8&amp;)</code> member

function of <code>TCheckedUid</code> when the length of the descriptor passed

to the function is not equal to the size of a <code>TCheckedUid</code> object. 

</p>

<code>41</code>

<p>

This panic is caused by the

<a href="../reference-cpp/E32_EKA2/UserHeapClass.html#%3a%3aUserHeap%3a%3aChunkHeap%28%29" title="function UserHeap::ChunkHeap()"><code class="ApiItem">UserHeap::ChunkHeap()</code></a> static function when the value

defining the minimum length of the heap is greater than the value defining the

maximum length to which the heap can grow. 

</p>

<code>42</code>

<p>

This panic is raised by a number of <a href="../reference-cpp/E32_EKA2/RHeapClass.html#%3a%3aRHeap" title="class RHeap"><code class="ApiItem">RHeap</code></a>

member functions, <code>AllocLen()</code>, <code>Free()</code>,

<code>FreeZ()</code>, <code>ReAlloc()</code>, <code>ReAllocL()</code>,

<code>Adjust()</code> and <code>AdjustL()</code> when a pointer passed to these

functions does not point to a valid cell. 

</p>

<code>43</code>

<p>

This panic is raised by the <code>Adjust()</code> and

<code>AdjustL()</code> member functions of an <a href="../reference-cpp/E32_EKA2/RHeapClass.html#%3a%3aRHeap" title="class RHeap"><code class="ApiItem">RHeap</code></a>. It is

caused when a heap cell is being shrunk and the amount by which the cell is

being shrunk is less than the current length of the cell. 

</p>

<code>44</code>

<p>

This panic is raised by the <code>Free()</code> and

<code>FreeZ()</code> member functions of an <a href="../reference-cpp/E32_EKA2/RHeapClass.html#%3a%3aRHeap" title="class RHeap"><code class="ApiItem">RHeap</code></a>. It is

caused when the cell being freed overlaps the next cell on the free list (i.e.

the first cell on the free list with an address higher than the one being

freed). 

</p>

<code>45</code>

<p>

This panic is raised by the <code>Free()</code> and

<code>FreeZ()</code> member functions of an <a href="../reference-cpp/E32_EKA2/RHeapClass.html#%3a%3aRHeap" title="class RHeap"><code class="ApiItem">RHeap</code></a>. It is

caused when the cell being freed overlaps the previous cell on the free list

(i.e. the last cell on the free list with an address lower than the one being

freed). 

</p>

<code>46</code>

<p>

This panic is raised by the <code>ReAlloc()</code> and

<code>ReAllocL()</code> member functions of an <a href="../reference-cpp/E32_EKA2/RHeapClass.html#%3a%3aRHeap" title="class RHeap"><code class="ApiItem">RHeap</code></a>. It

is caused when the cell being reallocated overlaps the next cell on the free

list (i.e. the first cell on the free list with an address higher than the one

being reallocated). 

</p>

<code>47</code>

<p>

This panic is raised by the <code>Alloc()</code>,

<code>AllocL()</code> or <code>AllocLC()</code> member functions of

<a href="../reference-cpp/E32_EKA2/RHeapClass.html#%3a%3aRHeap" title="class RHeap"><code class="ApiItem">RHeap</code></a>. It is caused by trying to allocate a cell from a

heap, specifying an unsigned size value which is greater than or equal to the

value of <code>KMaxTInt/2</code>. The constant <code>KMaxTInt</code> is defined

in <code class="filename">e32std.h</code>. 

</p>

<p>

This panic may also be raised by the heap walker when it finds a

bad allocated heap cell size. 

</p>

<code>48</code>

<p>

This panic is raised by the heap walker when it finds a bad

allocated heap cell address. 

</p>

<code>49</code>

<p>

This panic is raised by the heap walker when it finds a bad free

heap cell address. 

</p>

<code>51</code>

<p>

<em>This panic is raised in debug builds only.</em>

</p>

<p>

It is raised by the <code>__DbgMarkEnd()</code> member function of

<a href="../reference-cpp/E32_EKA2/RHeapClass.html#%3a%3aRHeap" title="class RHeap"><code class="ApiItem">RHeap</code></a> in debug builds when there has been no corresponding

call to the <code>__DbgMarkStart()</code> member function; it is also caused

when there are more calls to <code>__DbgMarkEnd()</code> than to

<code>__DbgMarkStart()</code>. These functions are part of the debug assistance

provided by the <a href="../reference-cpp/E32_EKA2/RHeapClass.html#%3a%3aRHeap" title="class RHeap"><code class="ApiItem">RHeap</code></a> class. 

</p>

<code>52</code>

<p>

This panic is raised by the <code>Adjust()</code> and

<code>AdjustL()</code> member functions of an <a href="../reference-cpp/E32_EKA2/RHeapClass.html#%3a%3aRHeap" title="class RHeap"><code class="ApiItem">RHeap</code></a>. It is

caused when the offset from the start of the cell being stretched or shrunk is

a negative value. 

</p>

<code>54</code>

<p>

This panic is raised by the <code>ReAlloc()</code> and

<code>ReAllocL()</code> member functions of an <a href="../reference-cpp/E32_EKA2/RHeapClass.html#%3a%3aRHeap" title="class RHeap"><code class="ApiItem">RHeap</code></a>. It

is caused when the new size for the cell being reallocated is a negative value.

</p>

<code>55</code>

<p>

This panic is caused by the

<a href="../reference-cpp/E32_EKA2/UserHeapClass.html#%3a%3aUserHeap" title="class UserHeap"><code class="ApiItem">UserHeap</code></a><code>::ChunkHeap()</code> static function when

the value defining the minimum length of the heap is negative. 

</p>

<code>56</code>

<p>

This panic is caused by the

<a href="../reference-cpp/E32_EKA2/UserHeapClass.html#%3a%3aUserHeap" title="class UserHeap"><code class="ApiItem">UserHeap</code></a><code>::ChunkHeap()</code> static function when

the value defining the maximum length to which the heap can grow, is negative. 

</p>

<code>57</code>

<p>

This panic is raised when closing a shared heap using the

<code>Close()</code> member function of <a href="../reference-cpp/E32_EKA2/RHeapClass.html#%3a%3aRHeap" title="class RHeap"><code class="ApiItem">RHeap</code></a> and the

access count is zero or negative. A zero or negative access count suggests that

an attempt is being made to close the heap too many times. 

</p>

<code>58</code>

<p>

This panic is raised when opening a heap for shared access using

the <code>Open()</code> member function of <a href="../reference-cpp/E32_EKA2/RHeapClass.html#%3a%3aRHeap" title="class RHeap"><code class="ApiItem">RHeap</code></a> and the

heap type is not <code>EChunkNormal</code>. 

</p>

<code>59</code>

<p>

This panic is raised by the <code>UnGet()</code> member function of

the 8-bit variant lexical analyzer, <a href="../reference-cpp/E32_EKA2/TLex8Class.html#%3a%3aTLex8" title="class TLex8"><code class="ApiItem">TLex8</code></a>, if the

character position is already at the start of the string. 

</p>

<code>60</code>

<p>

This panic is raised by the <code>Inc()</code> member function of

the 8-bit variant lexical analyzer, <a href="../reference-cpp/E32_EKA2/TLex8Class.html#%3a%3aTLex8" title="class TLex8"><code class="ApiItem">TLex8</code></a>, if the

resulting character position lies before the start of the string or after the

end of the string. 

</p>

<code>61</code>

<p>

This panic is raised by the <code>SkipAndMark()</code> member

function of the 8-bit variant lexical analyzer, <a href="../reference-cpp/E32_EKA2/TLex8Class.html#%3a%3aTLex8" title="class TLex8"><code class="ApiItem">TLex8</code></a>, if

the resulting character position lies before the start of the string or after

the end of the string. 

</p>

<code>63</code>

<p>

This panic is raised by the <code>ValidateMark()</code> member

function of the 8-bit variant lexical analyzer, <a href="../reference-cpp/E32_EKA2/TLex8Class.html#%3a%3aTLex8" title="class TLex8"><code class="ApiItem">TLex8</code></a>, if

the position of the extraction mark lies before the start of the string or

after the end of the string. 

</p>

<code>64</code>

<p>

This panic is raised by the <code>UnGet()</code> member function of

the 16-bit variant lexical analyzer, <a href="../reference-cpp/E32_EKA2/TLex16Class.html#%3a%3aTLex16" title="class TLex16"><code class="ApiItem">TLex16</code></a>, if the

character position is already at the start of the string. 

</p>

<code>65</code>

<p>

This panic is raised by the <code>Inc()</code> member function of

the 16-bit variant lexical analyzer, <a href="../reference-cpp/E32_EKA2/TLex16Class.html#%3a%3aTLex16" title="class TLex16"><code class="ApiItem">TLex16</code></a>, if the

resulting character position lies before the start of the string or after the

end of the string. 

</p>

<code>66</code>

<p>

This panic is raised by the <code>SkipAndMark()</code> member

function of the 16-bit variant lexical analyzer, <a href="../reference-cpp/E32_EKA2/TLex16Class.html#%3a%3aTLex16" title="class TLex16"><code class="ApiItem">TLex16</code></a>,

if the resulting character position lies before the start of the string or

after the end of the string. 

</p>

<code>68</code>

<p>

This panic is raised by the <code>ValidateMark()</code> member

function of the 16-bit variant lexical analyzer, <a href="../reference-cpp/E32_EKA2/TLex16Class.html#%3a%3aTLex16" title="class TLex16"><code class="ApiItem">TLex16</code></a>,

if the position of the extraction mark lies before the start of the string or

after the end of the string. 

</p>

<code>69</code>

<p>

This panic is raised by the <a href="../reference-cpp/E32_EKA2/TDateSuffixClass.html#%3a%3aTDateSuffix" title="class TDateSuffix"><code class="ApiItem">TDateSuffix</code></a>

constructor or its <code>Set()</code> member function when the suffix index

specified is negative or is greater than or equal to the value

<code>KMaxSuffixes</code> defined in <code class="filename">e32std.h</code>. The index is used

to access a locale dependent table of suffix characters which can be appended

to the dates of the month (e.g. the characters "st" for 1st, "nd" for 2nd, "st"

for 31st). 

</p>

<code>70</code>

<p>

<em>Introduced in 6.0:</em> This panic is raised when

attempting to complete a client/server request and the <code>RMessagePtr</code>

is null. 

</p>

<p>

<em>Withdrawn in 6.0:</em> This panic is raised by the

<code>SetRetry()</code> member function of <a href="../reference-cpp/E32_EKA2/RSessionBaseClass.html#%3a%3aRSessionBase" title="class RSessionBase"><code class="ApiItem">RSessionBase</code></a>,

the client interface for communication with a server, when the specified delay

time between resending a message to the server is either negative or a value

greater than KMaxTint (defined in e32std.h). 

</p>

<code>71</code>

<p>

<em>Withdrawn in 6.0:</em> This panic is raised by the

<code>SetRetry()</code> member function of <a href="../reference-cpp/E32_EKA2/RSessionBaseClass.html#%3a%3aRSessionBase" title="class RSessionBase"><code class="ApiItem">RSessionBase</code></a>,

the client interface for communication with a server, when the specified number

of attempts to resend a message to the server is either negative or a value

greater than <code>KMaxTint</code> (defined in <code class="filename">e32std.h</code>). 

</p>

<code>72</code>

<p>

<em>Withdrawn in 6.0:</em> This panic is raised by the

<code>SetRetry()</code> member function of <a href="../reference-cpp/E32_EKA2/RSessionBaseClass.html#%3a%3aRSessionBase" title="class RSessionBase"><code class="ApiItem">RSessionBase</code></a>,

the client interface for communication with a server, when the specified

operation code identifying the required service is either negative or a value

greater than <code>KMaxTint</code> (defined in <code class="filename">e32std.h</code>). 

</p>

<p>

<em>Introduced in 6.0:</em> This panic is raised by the

<code>Send()</code> and <code>SendReceive()</code> member functions of

<a href="../reference-cpp/E32_EKA2/RSessionBaseClass.html#%3a%3aRSessionBase" title="class RSessionBase"><code class="ApiItem">RSessionBase</code></a>, the client interface for communication with

a server, when the specified operation code identifying the required service is

either negative or a value greater than <code>KMaxTint</code> (defined in

<code class="filename">e32std.h</code>). 

</p>

<code>73</code>

<p>

This panic is raised by the <code>Receive()</code> member function

of <code>RServer</code>, the handle to the server, when the attempt to receive

a message for the server, synchronously, fails. 

</p>

<code>75</code>

<p>

This panic is raised by the constructor of a singly linked list

header, a <a href="../reference-cpp/E32_EKA2/TSglQueClass.html#%3a%3aTSglQue" title="class TSglQue"><code class="ApiItem">TSglQue</code></a> or by the <code>SetOffset()</code>

member function when the specified offset is not 4 byte aligned, i.e. when it

is not divisible by 4. 

</p>

<code>76</code>

<p>

This panic is raised when attempting to remove an object from a

singly linked list, using the <code>Remove()</code> member function of

<a href="../reference-cpp/E32_EKA2/TSglQueClass.html#%3a%3aTSglQue" title="class TSglQue"><code class="ApiItem">TSglQue</code></a>, when that object is not in the list. 

</p>

<code>78</code>

<p>

This panic is raised by the constructor of a doubly linked list

header, a <a href="../reference-cpp/E32_EKA2/TDblQueClass.html#%3a%3aTDblQue" title="class TDblQue"><code class="ApiItem">TDblQue</code></a> or by the <code>SetOffset()</code>

member function, when the specified offset is not 4 byte aligned, i.e. when it

is not divisible by 4. 

</p>

<code>79</code>

<p>

<em>This panic is raised in debug builds only.</em>

</p>

<p>

It is raised by a call to either the <code>First()</code> and

<code>Last()</code> member functions of a doubly linked list, a

<a href="../reference-cpp/E32_EKA2/TDblQueClass.html#%3a%3aTDblQue" title="class TDblQue"><code class="ApiItem">TDblQue</code></a>, which return pointers to the first and last

element in the list respectively; the panic occurs when the list is empty. 

</p>

<code>80</code>

<p>

<em>This panic is raised in debug builds only.</em>

</p>

<p>

It is raised by the post increment operator,

<code>operator++</code>, the post decrement operator, <code>operator&mdash;

</code>

and the return current element operator, <code>operator T*</code>, of the

doubly linked list iterator, a <a href="../reference-cpp/E32_EKA2/TDblQueIterClass.html#%3a%3aTDblQueIter" title="class TDblQueIter"><code class="ApiItem">TDblQueIter</code></a>; the panic

occurs when the element returned by these operators is not in the list.

Typically, this is caused by the removal of the element from the list prior to

calling these operators. 

</p>

<code>81</code>