For loop in C++11 standard when passing to a function

Asked Aug 02 '16 at 15:48

Active Aug 02 '16 at 15:48

Viewed 51 times

Okay. So I'm currently reading a C++11 book, which told me to try out that thing:

int v[] = {1,2,3,4,5};
for (auto i : v)
{
    std::cout<<i<<std::endl;
}

And yay, it works! But now, when I have:

#include <iostream>


void write(int* v)
{
    for (auto i : v)
    {
        std::cout<<i<<std::endl;
    }
}

int main(int argc, char** argv)
{
    int v[] = {1,2,3,4,5};
    write(v);
}

I get this: main.cpp:6:19: error: 'begin' was not declared in this scope for (auto i : v) and main.cpp:6:19: error: 'end' was not declared in this scope for (auto i : v) + 'suggested alternatives' (bunch of lines with mingw paths)

Am I doing something wrong, or there's no way to use this loop outside the function, where a collection was defined?

asked Aug 02 '16 at 15:48

minecraftplayer1234

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I think you need to call `write(&v)` to specify the beginning of the collection – pjcognetta Aug 02 '16 at 15:52
@pjcognetta, `&v` is a pointer to an array. Simply passing an array will decay it to an `int*`. – chris Aug 02 '16 at 15:59
1

The range based for loop requires begin() and end() to expose the range to be processed. Your write method takes an int* which does not satisfy this requirement. – David Thomas Aug 02 '16 at 15:59
So what should I pass/require in arguments? – minecraftplayer1234 Aug 02 '16 at 16:06

For loop in C++11 standard when passing to a function

0 Answers0