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Lets say I want to use hex() function. I know it is defined in <ios> header and I also know that it is included in <iostream> header. The difference is that in <iostream> are much more functions and other stuff I don't need.
From a performance stand-point, should I care about including/defining less functions, classes etc. than more?
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Generally, you only want to put the minimum necessary includes into a class header file, as anyone else who uses that header will be forced to #include all of them too.
A header is text that is placed at the top of a page, while a footer is placed at the bottom, or foot, of a page. Typically these areas are used for inserting document information, such as the name of the document, the chapter heading, page numbers, creation date and the like.
Include Syntax This form is used for system header files. It searches for a file named 'file' in a standard list of system directories. You can prepend directories to this list with the -I option while compiling your source code. This form is used for header files of your own program.
Headers and footers generally contain additional information such as page numbers, dates, an author's name, and footnotes, which can help keep longer documents organized and make them easier to read. Text entered in the header or footer will appear on each page of the document.
If the standard says it is defined in header <ios> then include header <ios> because you can't guarantee it will be included in/through any other header.
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