Re: [Mingw-users] Delete an element in a map while iterate on it

[Роман Д. <DXD...@ya...>]

TSalm <TS...@fr...> писал(а) в своём письме Thu, 10  
Sep 2009 01:29:23 +0400:

>> TSalm,
>>
>> This is a much general C++ question rather than that about MinGW. I
>> think the newsgroup comp.lang.c++ would be better.
>>
>> It is not safe to delete an element of a map before using the iterator
>> pointing to it. One of my methods may like this:
>>
>> for (map<string, string> it = myMap.begin(); it != myMap.end(); )
>> {
>>     if (it->first == "2") // condition for deleting
>>     {
>>         map<string, string> toDel = it;
>>         it++;
>>         myMap.erase(toDel);
>>     }
>>     else
>>     {
>>         it++;
>>     }
>> }
> Thanks, this work perfectly !
> And thanks too for your advice about comp.lang.c++.

Also of note is that in C++9x you will likely be able to delete by saying  
"it = myMap.erase(it)", as the definition of erase is amended to make it  
return an iterator to the next element. Until then, do the above.

Roman.