Disentangle VarOrder and BddPtr via PartialVariableOrder trait
#164
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…trait, fixes ref/lifetimes Two problems: 1. `VarOrder`'s `first`, `first_essential`, and `sort` methods rely on the input type being a `BddPtr`, which causes problems for #163. So, I've instead abstracted the idea of a partial variable order, i.e. that structs may or may not have a sortable variable, to a trait; `BddPtr` (and soon, `SemanticBddPtr`) implements this trait. This caused minimal code impact. 2. `first`, `first_essential`, and `sort` shouldn't consume their inputs, so I've changed these to just be refs. Required lifetime annotations. Then, added doctests for these methods!
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Two problems:
VarOrder'sfirst,first_essential, andsortmethods rely on the input type being aBddPtr, which causes problems for Semantic BDD Pointers! #163. So, I've instead abstracted the idea of a partial variable order, i.e. that structs may or may not have a sortable variable, to a trait;BddPtr(and soon,SemanticBddPtr) implements this trait. This caused minimal code impact.first,first_essential, andsortshouldn't consume their inputs, so I've changed these to just be refs. Required lifetime annotations.Then, added doctests for these methods!