Is there a reverse functionality of C++ substr which returns the substring from char 0 up till the given index? I cannot seem to find any posts here answering this question for C++. I am aware that it is possible to just reverse the string and then use substr, but I am wondering if there is a functionality which does this in one step.
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1You could use reverse iterators to walk a substring backwards, in-place; or copy the range (in reverse order) to another string.Igor Tandetnik– Igor Tandetnik2018-09-26 13:45:01 +00:00Commented Sep 26, 2018 at 13:45
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Use reverse iterators and copy the number of characters you need?Some programmer dude– Some programmer dude2018-09-26 13:45:03 +00:00Commented Sep 26, 2018 at 13:45
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3Don't write "SOLVED", just click on the checkmark at the answer to accept it.rustyx– rustyx2018-09-26 13:48:38 +00:00Commented Sep 26, 2018 at 13:48
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Thanks for your help, this is a rather obvious answer I wish I would have come up with myself.Hylke– Hylke2018-09-26 13:49:30 +00:00Commented Sep 26, 2018 at 13:49
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@rustyx I will do so as soon as I can.Hylke– Hylke2018-09-26 13:50:41 +00:00Commented Sep 26, 2018 at 13:50
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2 Answers
You may be looking for something like this:
std::string source = "something";
std::string dest(source.rbegin() + source.size() - given_index, source.rend());
Comments
String doesn't have this functionality. But you can make something like this:
int count=5;
std::string str="Hello World Budulai";
std::string res(str.begin(),str.begin()+count);
This code copy to res string, from 0 to count symbol;
If you mean zero char == '\0' so you need use reverse iterators. and this will like:
std::string res(str.rbegin(),str.rbegin()+count);
