Inserting a newline near the end of a std::string

Question

I'm struggling with trying to implement a C++ code solution that will allow me to insert a newline (i.e. a string literal '\n') towards the end of a std::string, and not at the very end as most implementations show.

For example, I want to insert a '\n' just -1 characters before the very end itself. So if the string was 100 characters long (poor analogy I know), then I'd like to insert the string literal at the 99th character in a clean, easily readable manner.

Thanks!

Perhaps [this `std::string` reference](https://en.cppreference.com/w/cpp/string/basic_string) could be of help? It should at least tell that there's a function ti *insert* characters into a string at an arbitrary (but valid) position. — Some programmer dude, Aug 07 '19 at 06:47

lubgr · Answer 1 · 2019-08-07T06:50:03.750

3

Here's one way:

std::string test{"abcdef"};

if (!test.empty())
   test.insert(test.length() - 1, "\n");

and here's one based on iterators:

if (!test.empty())
   test.insert(std::prev(test.end()), '\n');

edited Aug 07 '19 at 06:50

answered Aug 07 '19 at 06:47

lubgr

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Thank you kindly, none of the examples were near that simple. – Phobos D'thorga Aug 07 '19 at 06:49

Inserting a newline near the end of a std::string

1 Answers1