Adaptive_sizing_field fails to compile with epeck

[efifogel]

Issue Details

The title says it all.
It fails on line 266:
vertex_size /= CGAL::halfedges_around_target(v, pmesh).size();
The following fixes it
vertex_size /= FT(CGAL::halfedges_around_target(v, pmesh).size());

Source Code

Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/Adaptive_sizing_field.h

Environment

• Operating system (Windows/Mac/Linux, 32/64 bits): Ubuntu 22.04, (64)
• Compiler: gcc 11.4.0
• Release or debug mode: both
• Specific flags used (if any): none
• CGAL version: 6.0.1
• Boost version: irrelevant
• Other libraries versions if used (Eigen, TBB, etc.):

[lrineau]

The following fixes it
vertex_size /= FT(CGAL::halfedges_around_target(v, pmesh).size());

Actually, CGAL concept for our Kernel::FT types does not require that FT is constructible from std::size_t (returned by Iterator_range.size()), but only by int: concept FromIntConstructibl.

The correct code should be:

vertex_size /= FT(static_cast<int>(CGAL::halfedges_around_target(v, pmesh).size()));