Error in iterator declaration for std::map

Question

Declaration works when I declare an iterator like this:

map<string,int>::iterator it, temp;

Why doesn't the following work too?

map<string,int>temp, ::iterator it;

error: expected initializer before 'it'

Why is this causing an error?

Because it's not valid C++. You can't just write like you want, you have to follow the rules of the language. — Some programmer dude, Dec 20 '14 at 06:48
Why is this down vote ?? Is the question totally illogical ? — Ali Akber, Dec 20 '14 at 06:55

score 1 · Answer 1 · answered Dec 20 '14 at 06:51

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In the first case you are creating two iterators for the stl map. In the second case you are creating stl maps and c++ expects no space in the identifier and identifier should not start with ":" symbol (rules of c++ lang).

answered Dec 20 '14 at 06:51

gman

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Thanks :) I didn't aware of the fact – Ali Akber Dec 20 '14 at 07:01

score 1 · Accepted Answer · answered Dec 20 '14 at 06:52

1

iterator is a member type inside std::map container, to have a variable of this type you need to use the proper syntax, map<string,int>temp, ::iterator it; is simply wrong as complained by the compiler.

map<string,int>::iterator is a type, ::iterator is ill formed.

answered Dec 20 '14 at 06:52

P0W

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I didn't know that map::iterator is a type :( – Ali Akber Dec 20 '14 at 07:00
@AliAkber Its okay, now you know it – P0W Dec 20 '14 at 07:01
is the question totally illogical ? I'm wondering why i received these down vote ? Or people just do this as fun ? – Ali Akber Dec 20 '14 at 07:03
@AliAkber No its not illogical, but surely it didn't show any search efforts, there are several similar questions on StackOverflow, please do a search. – P0W Dec 20 '14 at 07:06
Obviously I searched.. but i didn't find these type of error or question :( May be i'm not good at searching :( – Ali Akber Dec 20 '14 at 07:08

Error in iterator declaration for std::map

2 Answers2