Q: linker error with a missing method

[Arne Schmitz]

Hi!

I get a mysterious linker error:

undefined reference to `Matrix<float>::operator()(unsigned, unsigned)'

And I do not know why. I've got the following two operators defined and
declared:

T& operator()(size_t x, size_t y);
T operator()(size_t x, size_t y) const;

The library also gets linked to the executable, but the linking fails
anyway. Why? I thought size_t and unsigned are synonymous?

In my program code I use something like this:

Matrix<float> m; ...
m(i,j) = 1.0f;

Any ideas?

Arne

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[Kevin Goodsell]

Arne Schmitz wrote:

Hi!

I get a mysterious linker error:

undefined reference to `Matrix<float>::operator()(unsigned, unsigned)'

And I do not know why. I've got the following two operators defined and
declared:

T& operator()(size_t x, size_t y);
T operator()(size_t x, size_t y) const;

The library also gets linked to the executable, but the linking fails
anyway. Why? I thought size_t and unsigned are synonymous?

In my program code I use something like this:

Matrix<float> m; ...
m(i,j) = 1.0f;

Any ideas?

The following FAQs might be relevant:

http://www.parashift.com/c++-faq-lit...t.html#faq-5.8
http://www.parashift.com/c++-faq-lit...html#faq-34.14

-Kevin
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My email address is valid, but changes periodically.
To contact me please use the address from a recent posting.

[Arne Schmitz]

Kevin Goodsell schrieb:

The following FAQs might be relevant:

http://www.parashift.com/c++-faq-lit...t.html#faq-5.8
http://www.parashift.com/c++-faq-lit...html#faq-34.14

Thank you. I should've checked the FAQ first, I see... didn't know it
existed though. I'll also try to conform to the posting guidelines next
time.

Thanks again,

Arne

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[E. Robert Tisdale]

Arne Schmitz wrote:

I get a mysterious linker error:

undefined reference to `Matrix<float>::operator()(unsigned, unsigned)'

And I do not know why.
I've got the following two operators defined and declared:

T& operator()(size_t x, size_t y);
T operator()(size_t x, size_t y) const;

The library also gets linked to the executable,
but the linking fails anyway.
Why? I thought size_t and unsigned are synonymous?
Evidently, Your compiler thinks so too.
In my program code I use something like this:

Matrix<float> m; ...
m(i,j) = 1.0f;

Any ideas?

I assume that templates exist somewhere for these operators.
But were they actually instantiated somewhere?