'What does Vector.size() returns exactly? Can we Compare it with an Integer directly? [duplicate]

I have an Int called "ListIndex" to store the value of the index, and a pointer of Vector called "EnqueryList".

So If I tried to compare ListIndex with (*EnqueryList).size() directly, it will give me the wrong result, but if I tried to store the value of (*EnqueryList).size() in another integer "Length" and then compare the value of length and value of ListIndex, the result would be correct, why is that?

    cout<<ListIndex<<":"<<(*Enquery).size()-1<<":"<<(ListIndex<(*Enquery).size()-1)<<"\n";
    cout<<ListIndex<<":"<<length<<":"<<(ListIndex<length)<<"\n";

The Result of the above Couts:

-1:2:0

-1:2:1

c++listvector


Solution 1:[1]

What does Vector.size() returns exactly?

Assuming that you actually mean std::vector::size, it returns the number of elements the vector contains. Same applies to the size member function of all standard containers.

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Solution Source
Solution 1 eerorika

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