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Using structs to define a function

roger911 (127)
What I'm trying to do : 
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struct foo {int x; int y;};

foo function_example(int x, int y)
{
    foo temp;
    temp.x = x;
    temp.y = y;
    return temp;
}


Works as is, however when I try doing it through seperate class files :
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//header file for class example_class
struct foo {int x; int y;};
foo function_example(int x, int y);

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//source file for example_class
foo example_class::function_example(int x, int y)
{
    foo temp;
    temp.x = x;
    temp.y = y;
    return temp;
}


I get an error telling me that foo is undefined, and that declaration of function_example(int x, int y) is incompatible with the declaration of it in the header file.

What am I doing wrong / What am I missing?
roger911 (127)
My apologies, I was declaring the struct inside the public declarations of the header file, when I should have declared it before that.

Solution :
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//header file
#pragma once

struct foo {int x; int y;};

class example_class
{
public:
    foo function_example(int x, int y);
...
...
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