Having split function in string library

[Radium Sharma]

Hi all,

I thought we should have a split function of string like other languages so thought of proposing an idea.

Following is the implementation for having a split function in c++ string module like other languages. 

Function signature  -   vector<string> split(string s, char delimiter);

The function should take a string which should be splitted as first argument and a delimiter which will decide based on what it should split like (',',' ').

It should return a vector of strings which are splitted based on the deimiter.

Following is the function code :-

vector<string> split(string s, char delimiter){

int n = s.length(), k=0;

vector<string> v;

for(int i=0;i<n;i++){

if(s[i]==delimiter){

string x = s.substr(k,i-k);

k=i+1;

v.push_back(x);

} else if(i==n-1){

string x = s.substr(k,i-k+1);

v.push_back(x);

}

}

return v;

}

Regards

Radium

[Ren Industries]

Why would we copy all these strings when std::string_view exists?

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[Cleiton Santoia]

You may implement this "generically", to work on other containers, std::array, plain arrays, vector, etc...

template< class ForwardIt1, class ForwardIt2, class OutIt >

void split( ForwardIt1 first, ForwardIt1 last, ForwardIt2 s_first, ForwardIt2 s_last, OutIt o ) { // 'o' may be anything

    auto sz = std::distance(s_first, s_last);

    auto next = first;

    while ( next != last ) {

        next = std::search(first, last, s_first, s_last);

        *o++ = { first, next } ; // <- copy elision guarantee that this is moving ?

        first = next;

        std::advance(first, sz);

    }

}

have fun :)  https://coliru.stacked-crooked.com/a/a020522ddc01b8bc

[doss...@cs.uregina.ca]

This has seemingly been suggested already:

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0540r1.html