GCC-15 compatibility #1242
Description
Two weeks ago, GCC merged some stricter template checks into the 15.x branch:
https://trofi.github.io/posts/322-gcc-15-template-checking-improvements.html
Our CI detected this build failure as a result:
In file included from gfanlib_mixedvolume.h:13,
from gfanlib_mixedvolume.cpp:8:
gfanlib_matrix.h: In function 'gfan::Matrix<typ> gfan::operator*(const Matrix<typ>&, const Matrix<typ>&)':
gfanlib_matrix.h:123:18: error: 'const class gfan::Matrix<typ>' has no member named 'vectormultiply'
123 | ret[i]=a.vectormultiply(b.column(i));
| ^~~~~~~~~~~~~~
There's no immediate danger, but fixing it now will avoid a flood of build failures when gcc-15 is released.