My question is pretty much the title. Example
#include <iostream>
int main()
{
using std::cout; //legal?
{
using std::cin; //legal?
}
}
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No problem. Backticks don't work to format code over multiple lines. Multiline code blocks must be indented by 4 spaces.sepp2k– sepp2k2010-10-14 15:32:50 +00:00Commented Oct 14, 2010 at 15:32
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s/iostrean/iostream Can't edit myself yet.usta– usta2010-10-14 15:38:48 +00:00Commented Oct 14, 2010 at 15:38
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What's the reason for downvoting the question?Armen Tsirunyan– Armen Tsirunyan2010-10-14 15:41:19 +00:00Commented Oct 14, 2010 at 15:41
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@Daniel. No, it's not. There are many things that would compile on my compiler (MSVC9.0) which are NOT legal. I don't know why I started doubting about this so I asked here.Armen Tsirunyan– Armen Tsirunyan2010-10-14 19:29:28 +00:00Commented Oct 14, 2010 at 19:29
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So why don't try to use it. Add cin inside of scope where using cin, also add cin (without the std::) outside scope. Also can you give an "example" of illegal thing that compiles?Kamil Klimek– Kamil Klimek2010-10-15 06:40:51 +00:00Commented Oct 15, 2010 at 6:40
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3 Answers
Yes, it's legal. In fact, it's preferred over doing it at file scope...
2 Comments
Armen Tsirunyan
I am sorry but I haven't heard of such a thing as a file scope
sje397
Does the same apply to
using namespace?- 7.3.3 The using declaration
A using-declaration introduces a name into the declarative region in which the using-declaration appears.
And, since someone asked in a comment about using namespace:
- 7.3.4 Using directive
A using-directive shall not appear in class scope, but may appear in namespace scope or in block scope.
Comments
Why didn't you test it? It works alright.
