Question about the std namespace (documentation, not usage)

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    Question about the std namespace (documentation, not usage)

    Hi all,

    I've recently moved to programming in C++ and I just had a quick question about the std namespace. I'm okay with the syntax, and I've read up on why namespaces were instituted, I'm just having trouble finding some info online:

    Recently, when using the <vector> library, I had to do some fiddling about until I realized I need to preface declarations with std:: as with functions like std::cin and std::cout. I've avoided using the line "using namespace std" as I've read it can lead to confusion in more complicated programming.

    Can anyone point me to a resource which has a comprehensive list of which libraries fall under the std namespace?

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    and the Hat of Guessing tabstop's Avatar
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    Quote Originally Posted by Ocifer View Post
    Hi all,

    I've recently moved to programming in C++ and I just had a quick question about the std namespace. I'm okay with the syntax, and I've read up on why namespaces were instituted, I'm just having trouble finding some info online:

    Recently, when using the <vector> library, I had to do some fiddling about until I realized I need to preface declarations with std:: as with functions like std::cin and std::cout. I've avoided using the line "using namespace std" as I've read it can lead to confusion in more complicated programming.

    Can anyone point me to a resource which has a comprehensive list of which libraries fall under the std namespace?
    All of them, or at least all of them that are "built-in" C++. If you go somewhere like cplusplus.com, you'll see what's standard and what's not.

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    Thanks. For anyone who has a similar question, I found what I was looking for at:

    Reference - C++ Reference

    If it helps clear this up for anyone else, my confusion was that I thought the preface " std:: " was only used for standard iostream functions like cin or cout or cin.get, etc... This is not the case, and rather at the above link there are a number of different commonly-used libraries which fall under the "std" namespace, of which <vector> is one.
    Last edited by Ocifer; 05-27-2011 at 12:57 PM.

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    C++まいる!Cをこわせ! Elysia's Avatar
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    Everything in the C++ standard library lies in the std namespace. So when you include a standard header (eg, vector, map, algorithm), all functions and classes will be in std!
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

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