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/*
Copyright 2017 Martin Buck
This file is part of rust-3d.
rust-3d is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
rust-3d is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with rust-3d.  If not, see <http://www.gnu.org/licenses/>.
*/

//! IsTopologyUnit trait used for single units of a topology. E.g. size 1 for paths, size 3 for tri meshes, size 4 for quad meshes

use prelude::*;

/// IsTopologyUnit trait used for single units of a topology. E.g. size 1 for paths, size 3 for tri meshes, size 4 for quad meshes
pub trait IsTopologyUnit {
    /// Should return the number of indices a unit is defined with. (e.g. 3 for a tri mesh)
    fn n_vids() -> usize;
    /// Should return the vertex id of the nth element of this unit. Failure if index out of bounds
    fn get_vid(&self, index: usize) -> Result<VId>;
}