Re: map (associative array) loses values?
On 2007-09-11 11:42:18 -0400, jeroenvlek@gmail.com said:
Hi there,
I've never done this before, so I don't know about any layout
possibilities. My apologies :)
The problem is this:
I've written a function:
map<const char*, int> *SearchText::countWords()
{
map<const char*, int> *table = new map<const char*, int>;
There's no reason to create this map on the heap. Make it a local
(*table)["aap"] = 1;
(*table)["noot"] = 2;
cout << (*table)["aap"] << endl;
cout << (*table)["noot"] << endl;
return table;
}
Which I want to use like this:
try {
SearchText *text = new SearchText("test.txt");
map<const char*, int> *table = text->countWords();
cout << (*table)["aap"] << endl;
cout << (*table)["noot"] << endl;
}
catch(int ex) {
cout << "Could not open file." << endl;
}
However, I get the following output:
1
2
0
0
Meaning that the first two output statements (in the function itself)
do their job and the second two do not.
I guess it's some sort of allocation problem, but what could I do
different? I guess I could use maybe malloc or calloc, but shouldn't
this be also possible with new?
BTW making table static in the function didn't help.
--
Pete
Roundhouse Consulting, Ltd. (www.versatilecoding.com) Author of "The
Standard C++ Library Extensions: a Tutorial and Reference
(www.petebecker.com/tr1book)
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