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MarkS

What is the purpose of std::array?

7 posts in this topic

I thought I would try it and I found it... superfluous. huh.png What am I missing? All it seems to be is a wrapper surrounding a standard C array. It doesn't seem extend array functionality beyond what is already possible in C/C++, Why include a file and have to compile a couple hundred lines of code when "std::array<int,10> a;" is equivalent to "int a[10];"? Very Rube Goldberg-ish.

 

I am assuming there is a point to this?dry.png

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You may want to reconsider that example. The array is passed by reference and for for-each statement works with array types, so you can in fact pass an array and have it print all its values.

Heh, good catch. The first time I wrote it I used typename T::value_type, so arrays didn't work. My simplification broke my example smile.png
 

I'll fix it up...

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Try passing int a[10] to a function and getting its size wink.png
 

 

You mean like this?

 

template <class T, int N>
void printSizeOfArray(const T (&)[N])
{
    std::cout << N << std::endl;
}
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It makes the array interface the same as other stl containers. It also allows passing and returning arrays by value. Arrays were a bit of a strange beast compared to other containers, but not with std::array.

Now, I would say it's better to use std::array, and leave the primitive array syntax as legacy.
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Try passing int a[10] to a function and getting its size wink.png

 
You mean like this?
template <class T, int N>
void printSizeOfArray(const T (&)[N])
{
    std::cout << N << std::endl;
}

Exactly. I wasn't saying you couldn't, but now you've just written the ugly code yourself instead of using std::array. The ugly code has got to live somewhere. You might as well let it live outside of your own code. It's even uglier if you're passing multiple array structures.

Edited by Cornstalks
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