−one This would not remedy the question in the title, “When is #include library demanded in C++?”. I suppose that that will be Okay With all the OP. Nonetheless it's problem when this question is employed as referent for just a close-as-copy of some other concern. In India, a https://fab-directory.com/listings13499689/the-best-side-of-best-stock-music-sites-royalty-free-spotify