std :: set :: iterator的大小是否有限制？

Question

I have a std::set of strings and I want to iterate over them, but the iterator is behaving differently for different sizes of set. Given below is the code snippet that I'm working on:

int test(set<string> &KeywordsDictionary){
    int keyword_len = 0;
    string word;
    set<string>::iterator iter;

    cout << "total words in the database : " << KeywordsDictionary.size() << endl;

    for(iter=KeywordsDictionary.begin();iter != KeywordsDictionary.end();iter++) {

        cout << *iter;

        word = *iter;
        keyword_len = word.size();

        if(keyword_len>0)
            Dosomething();
        else
            cout << "Length of keyword is <= 0" << endl;
    }
    cout << "exiting test program"  << endl;
}

The code is working properly & *iter is being dereferenced & assigned to word until the size of KeywordsDictionary is around 15000. However when the size of KeywordsDictionary increases beyond 15000,

1. the print statement cout << *iter; is printing all the contents of KeywordsDictionary correctly.
2. but the pointer to the iterator *iter is not being dereferenced & not being assigned to word . word is just being an empty string.

EDIT: And the output of the program is :

total words in the database : 22771
�z���AAAADAAIIABABBABLEABNABOUTACACCEPTEDACCESSACCOUNT...
Length of keyword is <= 0
exiting test program

So basically, I'm guessing the loop is executing only once.

Answer 1

Try to declare keyword_len as

std::string::size_type keyword_len = 0;

instead of

int keyword_len = 0;