Sparse matrices operators in C++ using liboctave

[Basilio]

Hi all,
I'm trying to use a Sparse-to-scalar comparison operator (==) between
Sparse<uint8_t> and uint8_t, and I would like to use one of the operators in
the macros from Sparse-op-defs.h,
like SPARSE_SMS_CMP_OP_DECLS(M, S, API) or SPARSE_SMS_CMP_OP(M, S, API).
I tried to do
SPARSE_SMS_CMP_OP_DECLS (Sparse<uint8_t>, uint8_t, OCTAVE_API)
in my code, and used mx_el_eq to make the desired comparison and get the
resulting sparse bool matrix.
When I try to compile, it gives me a linker error, like

ca2d.cc:(.text+0x1364): undefined reference to `mx_el_eq(Sparse<unsigned
char> const&, unsigned char const&)'
ca2d.cc:(.text+0x15d4): undefined reference to `mx_el_eq(Sparse<unsigned
char> const&, unsigned char const&)'
collect2: ld returned 1 exit status

I used boolean operators mx_el_and, mx_el_or without any problem.
Can anyone help me in using == and other comparison operators with
Sparse<uint8_t>?
Thanks!

bas
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