How can I sort a vector of objects using string?

Question

I have a class like this:

class student
{
    public:
    string name;
    int age;
    int rollnum;
    int year;
    string father;
    string mother;
    string category;
    string region;
    char sex;
    string branch;
    int semester;
};

I have created a vector (vector j1) of such class student, and now I want to sort them on the basis of their name.

How can I do that?

PS: I did this.

student lessthan
{
    bool operator() (const student& h1, const student& h2)
    {
        return (h1.name < h2.name);
    }
};

And then did this,

sort(j1.begin(),j1.end(),lessthan());

But this shows an error saying expected primary expression before bool.

lessthan should be a class/struct. typo about student ? — Jarod42
– Jarod42, Commented Aug 31, 2014 at 16:30
char sex; This is not exactly type-safe. It supposedly allows for 'M' and 'F'. Or 'm' and 'f'? Or both? What if someone accidentally assigns 'a' or 'b', or 123 or 255 or 0? You should at least use an enum. — Christian Hackl
– Christian Hackl, Commented Aug 31, 2014 at 16:34

David G · Accepted Answer · 2014-08-31 16:33:04Z

3

sort( j1.begin(),
     j1.end(),
     [](const student& s1, const student& s2){ return s1.name < s2.name;} );

edited Aug 31, 2014 at 16:33

David G

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answered Aug 31, 2014 at 16:30

user1935024

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2 Comments

nwp Over a year ago

begin(j1) instead of j1.begin() to be slightly more idiomatic.

Cole Tobin Over a year ago

Might want to explain that's a lambda.

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