Extracting, then passing raw data into another class - How to avoid copying twice while maintaining
- by Kache4
Consider a class Book with a stl container of class Page. each Page holds a screenshot, like page10.jpg in raw vector<char> form.
A Book is opened with a path to a zip, rar, or directory containing these screenshots, and uses respective methods of extracting the raw data, like ifstream inFile.read(buffer, size);, or unzReadCurrentFile(zipFile, buffer, size). It then calls the Page(const char* stream, int filesize) constructor.
Right now, it's clear that the raw data is being copied twice. Once to extract to Book's local buffer and a second time in the Page ctor to the Page::vector<char>. Is there a way to maintain encapsulation while getting rid of the middleman buffer?
