Re: assignment/initialization of container - map

From:
"Thomas Tutone" <Thomas8675309@yahoo.com>
Newsgroups:
comp.lang.c++
Date:
18 Jul 2006 10:53:00 -0700
Message-ID:
<1153245180.399478.155530@h48g2000cwc.googlegroups.com>
xuatla wrote:

I want to define a map:

std::map<string, int> myMap;

e.g., the score of students. Then I can assign the value as follows:
myMap["stud1"] = 90;
myMap["stud2"] = 60;
...

My question now is: can I assign the name of many students in one line?
e.g., for array we have the following way:
     int myArray[] = { 1, 3, 4, 5 };

Do we have similar way for map?


No.

std::map<string, int> myMap = { ("stud1", 90), ("stud2", 60) };
                   // wrong code

Another question: how can I print the score of a given student's name?

void getScore(std::map<string, int> myMap, const std::string& stuName)
{
     return myMap.find(stuName)->second();
}

Is this correct? Any better solution?


First, unless you want to DRASTICALLY inefficient, better to pass the
map by reference instead of by value. Second, you can't return a value
if you declare the function void. Finally, although theoretically
slightly less efficient, more clear in my view is to use operator[] and
dump the separate function altogether:

    myMap[stuName]

or if you insist on the separate function, make it:

int getScore(std::map<string, int>& myMap, const std::string& stuName)
{
    return myMap[stuName];
}

Best regards,

Tom

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