Newbie: STL Map Container find method functioN

[lakepeir]

Hello,

I'm having problems with the find function of the STL map structure.
Whenever I call the find method with an ID, the else is executed as if
the value exist in the map. The ID does not exist in the map because I
haven't added it.

Here's the Code:
std::map<CComVariant, CComPtr<Interface> > mymap;
DWORD ID;

if( mymap.find(ID) == mymap.end() )
{
//do something
}
else
{
//do something
}

Any help is appreciated. Thanks.

 

[TB]

(e-mail address removed) skrev:

Hello,

I'm having problems with the find function of the STL map structure.
Whenever I call the find method with an ID, the else is executed as if
the value exist in the map. The ID does not exist in the map because I
haven't added it.

Here's the Code:
std::map<CComVariant, CComPtr<Interface> > mymap;
DWORD ID;

Maybe you should initialize 'ID'.

if( mymap.find(ID) == mymap.end() )
{
//do something
}
else
{
//do something
}

Any help is appreciated. Thanks.

How does CComVariant perform equality testing?

 

[lakepeir]

ID is actually passed in as a parameter. I just wanted to state it was
a DWORD.

 

[Richard Herring]

(e-mail address removed) skrev:

Maybe you should initialize 'ID'.


How does CComVariant perform equality testing?

Almost but not quite. The relevant question (for std::map) is
"how does CComVariant perform less-than comparisons?" If that isn't a
strict weak ordering, none of std::map's operations will work properly.

Also, how does DWORD get converted to CComVariant? The argument to
map::find should be a (const reference to) key_value, which is
CComVariant, not DWORD.