Hey guys. It's there a way to make an include statement

Question

Hey guys. It's there a way to make an include statement

inside a function?
I was working on a hackerrank problem. It allows me to write only inside the provided function.
It uses std namespace, and included vector and iostream.
However I need an unordered map.
So I implemented it using vector inside that function. But now I'm thinking maybe somehow I could include it? With some hacks maybe...

0

12.03.2021

19 ответов

7 просмотров

Ishkhan Автор вопроса

Sunbro
https://en.cppreference.com/w/cpp/preprocessor/inc...

Yeah I know but it didn't work out of box. Compilation errors. I'm guessing it's because of using namespace std

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12.03.2021

Sunbro

Ishkhan
Yeah I know but it didn't work out of box. Compila...

then you should come again with the actual error :)

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12.03.2021

Ishkhan Автор вопроса

Sunbro
then you should come again with the actual error :...

Yeah that's a topic for another day...

0

12.03.2021

Sunbro

Ishkhan
Yeah I know but it didn't work out of box. Compila...

and it prolly worked. you just had as you stated just another error not related to the include statement itself

0

12.03.2021

Ishkhan Автор вопроса

Sunbro
and it prolly worked. you just had as you stated j...

I do remember, that the error message contained something related to namespace. So tell me this. Assuming that in unordered map header there is a namespace std statement. Is this valid code? using namespace std; ... ... .. void r() { namespace std{...}; }

0

12.03.2021

Sunbro

Ishkhan
I do remember, that the error message contained so...

its valid but you created the namespace std::std inside your r() function which is prolly not what you want

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12.03.2021

Sunbro

Sunbro
its valid but you created the namespace std::std i...

which is actually one of the reasons for the convention having the include statements at the top (which still does not mean that it must always be the case)

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12.03.2021

Ishkhan Автор вопроса

Sunbro
its valid but you created the namespace std::std i...

Well do I have a choice in this case?

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12.03.2021

Sunbro

Ishkhan
Well do I have a choice in this case?

i dont think you can open up the std statement mid block, but if whatever is creating the new namespace is on your included statement, then you could a. remove the using namespace statement (always better) or b. if you are in possesion of the included source, remove the namespace declaration out of it or you could try out declaring the std namespace from the top... like namespace ::std { } although i dont quite know whether it would compile at this point

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12.03.2021

Ishkhan Автор вопроса

Sunbro
i dont think you can open up the std statement mid...

I can't edit anything outside the function block

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12.03.2021

Chandradeep Dey

> Is there a way to make an include statement inside a function? yes > is there a way to add #include <unordered_map> inside a function? no

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12.03.2021

Ishkhan Автор вопроса

Chandradeep Dey
> Is there a way to make an include statement insi...

Why not?

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12.03.2021

Chandradeep Dey

Ishkhan
Why not?

the easiest breaking point will be functions defined inside the function

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12.03.2021

Ishkhan Автор вопроса

Chandradeep Dey
the easiest breaking point will be functions defin...

Well I implemented unordered map class inside that function

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12.03.2021

Chandradeep Dey

Ishkhan
Well I implemented unordered map class inside that...

<unordered_map> probably contains much more than just classes.

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12.03.2021

Ihor

Ishkhan
Well I implemented unordered map class inside that...

Probably they wanted you solve the issue without unordered_map

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12.03.2021

Ishkhan Автор вопроса

Ihor
Probably they wanted you solve the issue without u...

Quite possible

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12.03.2021

Chandradeep Dey

Ihor
Probably they wanted you solve the issue without u...

this is definitely the case

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12.03.2021

Sunbro · Accepted Answer

Sunbro

https://en.cppreference.com/w/cpp/preprocessor/include c and cpp inclusion simply copies the content of the file right where your statement is so... go nuts with including

0

12.03.2021

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Hey guys. It's there a way to make an include statement

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