C++, MFC, check two list, best way

Question

C++, MFC, check two list, best way

Markus Freitag 3,791

Hello,
I have a default list and must check whether all values are contained in my dictionary map.

A) Are all default values available in my dictionary? Yes or no?

B) Are all the default values exactly in my dictionary? It has to be exactly the same.

How can I best solve the problem. With map, dictionary, vector or something else

Thanks in advance for examples.

David Lowndes 4,726 Reputation points

2021-11-06T16:52:33.91+00:00

"best" depends!
What does your intuition tell you to try, and have you tried it? What's wrong with what you've tried?
RLWA32 49,536 Reputation points

2021-11-06T19:09:24.327+00:00

Maybe use the EAN code as the key for your dictionary?
Markus Freitag 3,791 Reputation points

2021-11-07T11:21:54.493+00:00

What does your intuition tell you to try, and have you tried it? What's wrong with what you've tried?Blockquote

I take the default value and run through the map and compare it with the value.
Nothing is wrong. It works. I wanted to know there is something quick in the standard library to solve the requirement. I have little experience with C ++, the Standard Library.

Maybe I can take the default value and call a find method in the Dictionary/Map comparison.

there is already a ready-made function that compares a list, or that can bring them together. Like merge?
if the merge has more entries it is at least different.

Maybe you still have a few tips for me. Thanks in advance.
Markus Freitag 3,791 Reputation points

2021-11-07T11:23:53.99+00:00

OK and then compare the keys with the default. Then come, the EAN may only appear once. Key is only allowed once. Yes, it should be considered.
RLWA32 49,536 Reputation points

2021-11-07T12:10:50.637+00:00

You should clarify if your code is using the Standard C++ library map class or the .Net Dictionary class.
Markus Freitag 3,791 Reputation points

2021-11-07T18:10:59.44+00:00

Yes it is C++, MFC.
Is in C++ a dictionary like in C# available?
I found only map from Standard Library.

In .NET, C# it is easier.
RLWA32 49,536 Reputation points

2021-11-07T19:00:56.707+00:00

From what you have described the map class seems like an appropriate choice to me.

2 answers

Your answer

David Lowndes 4,726 Reputation points

2021-11-06T16:52:33.91+00:00

"best" depends!
What does your intuition tell you to try, and have you tried it? What's wrong with what you've tried?
RLWA32 49,536 Reputation points

2021-11-06T19:09:24.327+00:00

Maybe use the EAN code as the key for your dictionary?
Markus Freitag 3,791 Reputation points

2021-11-07T11:21:54.493+00:00

What does your intuition tell you to try, and have you tried it? What's wrong with what you've tried?Blockquote

I take the default value and run through the map and compare it with the value.
Nothing is wrong. It works. I wanted to know there is something quick in the standard library to solve the requirement. I have little experience with C ++, the Standard Library.

Maybe I can take the default value and call a find method in the Dictionary/Map comparison.

there is already a ready-made function that compares a list, or that can bring them together. Like merge?
if the merge has more entries it is at least different.

Maybe you still have a few tips for me. Thanks in advance.
Markus Freitag 3,791 Reputation points

2021-11-07T11:23:53.99+00:00

OK and then compare the keys with the default. Then come, the EAN may only appear once. Key is only allowed once. Yes, it should be considered.
RLWA32 49,536 Reputation points

2021-11-07T12:10:50.637+00:00

You should clarify if your code is using the Standard C++ library map class or the .Net Dictionary class.
Markus Freitag 3,791 Reputation points

2021-11-07T18:10:59.44+00:00

Yes it is C++, MFC.
Is in C++ a dictionary like in C# available?
I found only map from Standard Library.

In .NET, C# it is easier.
RLWA32 49,536 Reputation points

2021-11-07T19:00:56.707+00:00

From what you have described the map class seems like an appropriate choice to me.

Answer 1

RLWA32 49,536

If the EAN code is used as a key then for a .Net Dictionary you can use the ContainsKey method and in a Standard C++ library map object you could use the find method

Answer 2

Petrus 【KIM】 546

How about ...

ATL::CAtlList<int> oValueList;
ATL::CAtlMap<int, int> oValueCountMap;

int nCount = oValueCountMap.Find(1234567890);

When you create the "Current List, Dictionary" with std::map or ATL::CAtlMap,
just count, how many value in that.
Then insert or add the key(value) and Count to "oValueCountMap"...

You can find the count.

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C++, MFC, check two list, best way

2 answers

Your answer