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author | 2016-08-30 11:47:35 +0200 | |
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committer | 2016-08-30 11:47:35 +0200 | |
commit | 4f21c45748816c9e0cd4f93fa6f6d167e9757f81 (patch) | |
tree | f22bde63a6522883782ada4c40fa6b5c1ff1cc4c /tactics/tactics.ml | |
parent | 2ff6d31c7a6011b26dfa7f0b2bb593b356833058 (diff) |
CLEANUP: switching from "right-to-left" to "left-to-right" function composition operator.
Short story:
This pull-request:
(1) removes the definition of the "right-to-left" function composition operator
(2) adds the definition of the "left-to-right" function composition operator
(3) rewrites the code relying on "right-to-left" function composition to rely on "left-to-right" function composition operator instead.
Long story:
In mathematics, function composition is traditionally denoted with ∘ operator.
Ocaml standard library does not provide analogous operator under any name.
Batteries Included provides provides two alternatives:
_ % _
and
_ %> _
The first operator one corresponds to the classical ∘ operator routinely used in mathematics.
I.e.:
(f4 % f3 % f2 % f1) x ≜ (f4 ∘ f3 ∘ f2 ∘ f1) x
We can call it "right-to-left" composition because:
- the function we write as first (f4) will be called as last
- and the function write as last (f1) will be called as first.
The meaning of the second operator is this:
(f1 %> f2 %> f3 %> f4) x ≜ (f4 ∘ f3 ∘ f2 ∘ f1) x
We can call it "left-to-right" composition because:
- the function we write as first (f1) will be called first
- and the function we write as last (f4) will be called last
That is, the functions are written in the same order in which we write and read them.
I think that it makes sense to prefer the "left-to-right" variant because
it enables us to write functions in the same order in which they will be actually called
and it thus better fits our culture
(we read/write from left to right).
Diffstat (limited to 'tactics/tactics.ml')
-rw-r--r-- | tactics/tactics.ml | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/tactics/tactics.ml b/tactics/tactics.ml index 51bbd9058..7519339ca 100644 --- a/tactics/tactics.ml +++ b/tactics/tactics.ml @@ -169,7 +169,7 @@ let unsafe_intro env store decl b = Refine.refine ~unsafe:true { run = begin fun sigma -> let ctx = named_context_val env in let nctx = push_named_context_val decl ctx in - let inst = List.map (mkVar % NamedDecl.get_id) (named_context env) in + let inst = List.map (NamedDecl.get_id %> mkVar) (named_context env) in let ninst = mkRel 1 :: inst in let nb = subst1 (mkVar (NamedDecl.get_id decl)) b in let Sigma (ev, sigma, p) = new_evar_instance nctx sigma nb ~principal:true ~store ninst in @@ -366,7 +366,7 @@ let rename_hyp repl = let nhyps = List.map map hyps in let nconcl = subst concl in let nctx = Environ.val_of_named_context nhyps in - let instance = List.map (mkVar % NamedDecl.get_id) hyps in + let instance = List.map (NamedDecl.get_id %> mkVar) hyps in Refine.refine ~unsafe:true { run = begin fun sigma -> Evarutil.new_evar_instance nctx sigma nconcl ~store instance end } |