From 224d9841840dfd80800faab54ad4c2bf63108ccd Mon Sep 17 00:00:00 2001
From: David Allemang <david.allemang@kitware.com>
Date: Sat, 19 Nov 2022 12:31:46 -0500
Subject: [PATCH] wip - add Path<> stub; remove old.

---
 tc/CMakeLists.txt      |   1 -
 tc/include/tc/core.hpp |   9 +++-
 tc/include/tc/util.hpp | 107 -----------------------------------------
 tc/src/lang.cpp        |   1 -
 4 files changed, 8 insertions(+), 110 deletions(-)
 delete mode 100644 tc/include/tc/util.hpp

diff --git a/tc/CMakeLists.txt b/tc/CMakeLists.txt
index 5d632eb..f17105a 100644
--- a/tc/CMakeLists.txt
+++ b/tc/CMakeLists.txt
@@ -1,7 +1,6 @@
 add_library(tc
     include/tc/core.hpp
     include/tc/groups.hpp
-    include/tc/util.hpp
 
     src/cosets.cpp
     src/group.cpp
diff --git a/tc/include/tc/core.hpp b/tc/include/tc/core.hpp
index db9fc6a..65f125a 100644
--- a/tc/include/tc/core.hpp
+++ b/tc/include/tc/core.hpp
@@ -44,6 +44,13 @@ namespace tc {
     template<typename Gen_=void>
     struct Group;
 
+    /**
+     * @brief Support generating values given a Cosets and transformation callback.
+     * @tparam Gen_ 
+     */
+    template<typename Gen_=void>
+    struct Path;  // todo not yet implemented
+    
     template<>
     struct Index<> {
         size_t operator()(size_t const &idx) const {
@@ -57,7 +64,7 @@ namespace tc {
 
         std::vector<Gen> _gens{};
 
-        explicit Index(std::vector<Gen> gens) : _gens(gens) {}
+//        explicit Index(std::vector<Gen> gens) : _gens(gens) {}
 
         size_t operator()(Gen const &gen) const {
             auto it = std::find(_gens.begin(), _gens.end(), gen);
diff --git a/tc/include/tc/util.hpp b/tc/include/tc/util.hpp
deleted file mode 100644
index 3387754..0000000
--- a/tc/include/tc/util.hpp
+++ /dev/null
@@ -1,107 +0,0 @@
-#pragma once
-
-#include <cstdlib>
-#include <vector>
-#include <algorithm>
-#include <functional>
-#include <limits>
-
-namespace tc {
-//    using Mult = uint16_t;
-//    constexpr Mult FREE = 0;
-
-    struct Action {
-        int from_idx = -1;
-        int gen = -1;
-
-        Action() = default;
-
-        Action(const Action &) = default;
-
-        Action(int from_idx, int gen)
-            : from_idx(from_idx), gen(gen) {
-        }
-    };
-
-    struct Path {
-        std::vector<Action> path;
-
-        Path() = default;
-
-        Path(const Path &) = default;
-
-        void add_row() {
-            path.resize(path.size() + 1);
-        }
-
-        [[nodiscard]] Action get(int to_idx) const {
-            return path[to_idx];
-        }
-
-        void put(int from_idx, int gen, int to_idx) {
-            path[to_idx] = Action(from_idx, gen);
-        }
-
-        template<class C, class T, class E>
-        void walk(
-            C &res,
-            T start,
-            std::vector<E> gens,
-            std::function<T(const T &, const E &)> op
-        ) const {
-            size_t s = size();
-            res.reserve(s);
-            res.push_back(start);
-
-            for (int i = 1; i < s; ++i) {
-                auto &action = path[i];
-                auto &from = res.get(action.from_idx);
-                auto &val = gens[action.gen];
-                res.push_back(op(from, val));
-            }
-        }
-
-        template<class T, class E>
-        [[nodiscard]] std::vector<T> walk(
-            T start,
-            std::vector<E> gens,
-            std::function<T(const T &, const E &)> op
-        ) const {
-            std::vector<T> res;
-            res.reserve(size());
-            res.push_back(start);
-
-            for (int i = 1; i < size(); ++i) {
-                auto &action = path[i];
-                auto &from = res[action.from_idx];
-                auto &val = gens[action.gen];
-                res.push_back(op(from, val));
-            }
-
-            return res;
-        }
-
-        template<class T>
-        [[nodiscard]] std::vector<T> walk(
-            T start,
-            std::function<T(const T &, const int &)> op
-        ) const {
-            std::vector<T> res;
-            res.reserve(size());
-            res.push_back(start);
-
-            for (int i = 1; i < size(); ++i) {
-                auto &action = path[i];
-                auto &from = res[action.from_idx];
-                auto &val = action.gen;
-                res[i] = op(from, val);
-            }
-
-            return res;
-        }
-
-        [[nodiscard]] size_t size() const {
-            return path.size();
-        }
-    };
-}
diff --git a/tc/src/lang.cpp b/tc/src/lang.cpp
index f6376ba..3b102cb 100644
--- a/tc/src/lang.cpp
+++ b/tc/src/lang.cpp
@@ -3,7 +3,6 @@
 #include <string>
 #include <cassert>
 
-#include <tc/util.hpp>
 #include <tc/core.hpp>
 #include <tc/groups.hpp>