restructure cmake project

src/groups.cpp

@@ -0,0 +1,132 @@
+#include "groups.h"
+
+namespace tc {
+    Group::Group(int ngens, const std::vector<Mult> &rels) : ngens(ngens) {
+        _mults.resize(ngens);
+        for (int i = 0; i < ngens; i++) {
+            _mults[i].resize(ngens, 2);
+        }
+
+        for (Mult m : rels) {
+            if (m.gen0 < m.gen1)
+                _mults[m.gen0][m.gen1] = m.mult;
+            else
+                _mults[m.gen1][m.gen0] = m.mult;
+        }
+    }
+
+    void Group::setmult(Mult m) {
+        if (m.gen0 < m.gen1)
+            _mults[m.gen0][m.gen1] = m.mult;
+        else
+            _mults[m.gen1][m.gen0] = m.mult;
+    }
+
+    std::vector<Mult> Group::get_mults() const {
+        std::vector<Mult> mults;
+        for (int i = 0; i < ngens - 1; i++) {
+            for (int j = i + 1; j < ngens; j++) {
+                mults.push_back({i, j, _mults[i][j]});
+            }
+        }
+        return mults;
+    }
+
+    Group Group::product(const Group &other) const {
+        int off = ngens;
+
+        Group g(ngens + other.ngens, get_mults());
+
+        for (Mult m : other.get_mults()) {
+            g.setmult({off + m.gen0, off + m.gen1, m.mult});
+        }
+
+        return g;
+    }
+
+    Group Group::power(int p) const {
+        Group g(ngens * p);
+
+        for (Mult m : get_mults()) {
+            for (int off = 0; off < g.ngens; off += ngens) {
+                g.setmult({off + m.gen0, off + m.gen1, m.mult});
+            }
+        }
+
+        return g;
+    }
+
+    Group operator*(const Group &g, const Group &h) {
+        return g.product(h);
+    }
+
+    Group operator^(const Group &g, const int &p) {
+        return g.power(p);
+    }
+
+    Group schlafli(const std::vector<int> &mults) {
+        int ngens = mults.size() + 1;
+        Group g(ngens);
+        for (int i = 0; i < mults.size(); i++) {
+            g.setmult({i, i + 1, mults[i]});
+        }
+        return g;
+    }
+
+    namespace group {
+        Group A(const int n) {
+            if (n == 0)
+                return Group(0);
+
+            return schlafli(std::vector<int>(n - 1, 3));
+        }
+
+        Group B(const int n) {
+            std::vector<int> mults(n - 1, 3);
+            mults[0] = 4;
+            return schlafli(mults);
+        }
+
+        Group D(const int n) {
+            std::vector<int> mults(n - 1, 3);
+            mults[n - 2] = 2;
+            Group g = schlafli(mults);
+            g.setmult({1, n - 1, 3});
+            return g;
+        }
+
+        Group E(const int n) {
+            std::vector<int> mults(n - 1, 3);
+            mults[n - 2] = 2;
+            Group g = schlafli(mults);
+            g.setmult({2, n - 1, 3});
+            return g;
+        }
+
+        Group F4() {
+            return schlafli({3, 4, 3});
+        }
+
+        Group G2() {
+            return schlafli({6});
+        }
+
+        Group H(const int n) {
+            std::vector<int> mults(n - 1, 3);
+            mults[0] = 5;
+            return schlafli(mults);
+        }
+
+        Group I2(const int n) {
+            return schlafli({n});
+        }
+
+        Group T(const int n, const int m) {
+            return I2(n) * I2(m);
+        }
+
+        Group T(const int n) {
+            return I2(n) ^ 2;
+        }
+    }
+}