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-rw-r--r--src/util/torus_array.h52
-rw-r--r--src/world.h35
2 files changed, 68 insertions, 19 deletions
diff --git a/src/util/torus_array.h b/src/util/torus_array.h
new file mode 100644
index 0000000..bef0c9f
--- /dev/null
+++ b/src/util/torus_array.h
@@ -0,0 +1,52 @@
+#ifndef LIFE_SRC_UTIL_TORUS_ARRAY_
+#define LIFE_SRC_UTIL_TORUS_ARRAY_
+
+#include <array>
+#include <cstdint>
+
+namespace life {
+namespace util {
+
+template<
+ typename TYPE,
+ std::size_t WIDTH,
+ std::size_t HEIGHT
+>
+class TorusArray {
+ static std::size_t toMatrixColumn(const std::ptrdiff_t x) {
+ if ( x >= 0 ) {
+ return x % WIDTH;
+ } else {
+ return WIDTH - ( std::abs(x) % WIDTH );
+ }
+ }
+
+ static std::size_t toMatrixRow(const std::ptrdiff_t y) {
+ if ( y >= 0 ) {
+ return y % HEIGHT;
+ } else {
+ return HEIGHT - ( std::abs(y) % HEIGHT );
+ }
+ }
+
+ public:
+ static const std::size_t width = WIDTH;
+ static const std::size_t height = HEIGHT;
+
+ TYPE get(const std::ptrdiff_t x, const std::ptrdiff_t y) const {
+ return this->matrix_[toMatrixRow(y)][toMatrixColumn(x)];
+ }
+
+ void set(const std::ptrdiff_t x, const std::ptrdiff_t y, TYPE&& value) {
+ this->matrix_[toMatrixRow(y)][toMatrixColumn(x)] = value;
+ }
+
+ private:
+ std::array<std::array<TYPE, WIDTH>, HEIGHT> matrix_;
+
+};
+
+}
+}
+
+#endif // LIFE_SRC_UTIL_TORUS_ARRAY_
diff --git a/src/world.h b/src/world.h
index e70e20e..a09eb5a 100644
--- a/src/world.h
+++ b/src/world.h
@@ -1,12 +1,12 @@
#ifndef LIFE_SRC_WORLD_H_
#define LIFE_SRC_WORLD_H_
-#include <array>
#include <stack>
#include <tuple>
#include <cstdint>
#include "util/box_traverser.h"
+#include "util/torus_array.h"
namespace life {
@@ -22,19 +22,16 @@ class World {
World():
area_(width, height) {
this->area_.for_each([&](std::size_t i, std::size_t j) {
- this->matrix_[j][i] = false;
+ this->matrix_.set(i, j, false);
});
}
- bool isLifeAt(std::ptrdiff_t x, std::ptrdiff_t y) const {
- if ( this->area_(x, y) ) {
- return this->matrix_[y][x];
- } else {
- return false; // end of world is dead
- }
+ bool isLifeAt(const std::ptrdiff_t x, const std::ptrdiff_t y) const {
+ return this->matrix_.get(x, y);
}
- std::uint8_t lifeDensityAt(std::size_t x, std::size_t y) const {
+ std::uint8_t lifeDensityAt(
+ const std::ptrdiff_t x, const std::ptrdiff_t y) const {
std::uint8_t counter{};
counter += this->isLifeAt(x - 1, y);
@@ -57,20 +54,20 @@ class World {
return this->population_;
}
- void summonLifeAt(std::size_t x, std::size_t y) {
+ void summonLifeAt(const std::ptrdiff_t x, const std::ptrdiff_t y) {
if ( this->area_(x, y) ) {
- if ( !this->matrix_[y][x] ) {
- this->matrix_[y][x] = true;
- this->population_ += 1;
+ if ( !this->matrix_.get(x, y) ) {
+ this->matrix_.set(x, y, true);
+ this->population_ += 1;
}
}
}
- void extinguishLifeAt(std::size_t x, std::size_t y) {
+ void extinguishLifeAt(const std::ptrdiff_t x, const std::ptrdiff_t y) {
if ( this->area_(x, y) ) {
- if ( this->matrix_[y][x] ) {
- this->matrix_[y][x] = false;
- this->population_ -= 1;
+ if ( this->matrix_.get(x, y) ) {
+ this->matrix_.set(x, y, false);
+ this->population_ -= 1;
}
}
}
@@ -83,7 +80,7 @@ class World {
this->area_.for_each([&](std::size_t i, std::size_t j) {
const std::uint8_t d{this->lifeDensityAt(i, j)};
- if ( this->matrix_[j][i] ) {
+ if ( this->matrix_.get(i, j) ) {
if ( d < 2 ) {
updates.emplace(i, j, false);
} else if ( d == 2 || d == 3 ) {
@@ -122,7 +119,7 @@ class World {
std::size_t age_{};
std::size_t population_{};
- std::array<std::array<bool, WIDTH>, HEIGHT> matrix_;
+ util::TorusArray<bool, WIDTH, HEIGHT> matrix_;
};