Fix a few typos and remove std::optional from wcf.

modules/wfc/array_2d.h

@@ -21,7 +21,7 @@ public:
 	Array2D(std::size_t p_height, std::size_t p_width, T p_value) {
 		height = p_height;
 		width = p_width;
-		data.resize(width * height, value);
+		data.resize(width * height, p_value);
 	}
 
 	const T &get(std::size_t i, std::size_t j) const {

modules/wfc/array_3d.h

@@ -20,7 +20,7 @@ public:
 		data.resize(width * height * depth);
 	}
 
-	Array3D(std::size_t height, std::size_t width, std::size_t depth, T value) {
+	Array3D(std::size_t p_height, std::size_t p_width, std::size_t p_depth, T value) {
 		height = p_height;
 		width = p_width;
 		depth = p_depth;

modules/wfc/overlapping_wfc.h

@@ -228,14 +228,14 @@ private:
 		return output;
 	}
 
-	std::optional<unsigned> get_pattern_id(const Array2D<T> &pattern) {
+	unsigned get_pattern_id(const Array2D<T> &pattern) {
 		unsigned *pattern_id = std::find(patterns.begin(), patterns.end(), pattern);
 
 		if (pattern_id != patterns.end()) {
 			return *pattern_id;
 		}
 
-		return std::nullopt;
+		return -1;
 	}
 
 	// Set the pattern at a specific position, given its pattern id
@@ -267,12 +267,14 @@ public:
 	}
 
 	// Run the WFC algorithm, and return the result if the algorithm succeeded.
-	std::optional<Array2D<T>> run() {
-		std::optional<Array2D<unsigned>> result = wfc.run();
-		if (result.has_value()) {
-			return to_image(*result);
+	Array2D<T> run() {
+		Array2D<unsigned> result = wfc.run();
+
+		if (result.width == 0 && result.height == 0) {
+			return Array2D<T>(0, 0);
 		}
-		return std::nullopt;
+
+		return to_image(result);
 	}
 };
 

modules/wfc/tiling_wfc.h

@@ -64,8 +64,7 @@ struct Tile {
 
 	// Generate the map associating an orientation id to the orientation
 	// id obtained when reflecting the tile along the x axis.
-	static std::vector<unsigned>
-	generate_reflection_map(const Symmetry &symmetry) {
+	static std::vector<unsigned> generate_reflection_map(const Symmetry &symmetry) {
 		switch (symmetry) {
 			case Symmetry::X:
 				return { 0 };
@@ -332,12 +331,14 @@ public:
 	}
 
 	// Run the tiling wfc and return the result if the algorithm succeeded
-	std::optional<Array2D<T>> run() {
-		auto a = wfc.run();
-		if (a == std::nullopt) {
-			return std::nullopt;
+	Array2D<T> run() {
+		Array2D<unsigned> a = wfc.run();
+
+		if (a.width == 0 && a.height == 0) {
+			return Array2D<T>(0, 0);
 		}
-		return id_to_tiling(*a);
+
+		return id_to_tiling(a);
 	}
 };
 

modules/wfc/wave.cpp

@@ -5,8 +5,7 @@
 namespace {
 
 // Return distribution * log(distribution).
-std::vector<double>
-get_plogp(const std::vector<double> &distribution) {
+std::vector<double> get_plogp(const std::vector<double> &distribution) {
 	std::vector<double> plogp;
 	for (unsigned i = 0; i < distribution.size(); i++) {
 		plogp.push_back(distribution[i] * log(distribution[i]));
@@ -65,9 +64,7 @@ void Wave::set(unsigned index, unsigned pattern, bool value) {
 	memoisation.sum[index] -= patterns_frequencies[pattern];
 	memoisation.log_sum[index] = log(memoisation.sum[index]);
 	memoisation.nb_patterns[index]--;
-	memoisation.entropy[index] =
-			memoisation.log_sum[index] -
-			memoisation.plogp_sum[index] / memoisation.sum[index];
+	memoisation.entropy[index] = memoisation.log_sum[index] - memoisation.plogp_sum[index] / memoisation.sum[index];
 	// If there is no patterns possible in the cell, then there is a
 	// contradiction.
 	if (memoisation.nb_patterns[index] == 0) {

modules/wfc/wfc.cpp

@@ -36,14 +36,14 @@ WFC::WFC(bool periodic_output, int seed,
 		unsigned wave_width) :
 		gen(seed), patterns_frequencies(normalize(patterns_frequencies)), wave(wave_height, wave_width, patterns_frequencies), nb_patterns(propagator.size()), propagator(wave.height, wave.width, periodic_output, propagator) {}
 
-std::optional<Array2D<unsigned>> WFC::run() {
+Array2D<unsigned> WFC::run() {
 	while (true) {
 		// Define the value of an undefined cell.
 		ObserveStatus result = observe();
 
 		// Check if the algorithm has terminated.
 		if (result == failure) {
-			return std::nullopt;
+			return Array2D<unsigned>(0, 0);
 		} else if (result == success) {
 			return wave_to_output();
 		}
@@ -90,8 +90,7 @@ WFC::ObserveStatus WFC::observe() {
 	// And define the cell with the pattern.
 	for (unsigned k = 0; k < nb_patterns; k++) {
 		if (wave.get(argmin, k) != (k == chosen_value)) {
-			propagator.add_to_propagator(argmin / wave.width, argmin % wave.width,
-					k);
+			propagator.add_to_propagator(argmin / wave.width, argmin % wave.width, k);
 			wave.set(argmin, k, false);
 		}
 	}

modules/wfc/wfc.h

@@ -37,7 +37,7 @@ public:
 			unsigned wave_width);
 
 	// Run the algorithm, and return a result if it succeeded.
-	std::optional<Array2D<unsigned>> run();
+	Array2D<unsigned> run();
 
 	// Return value of observe.
 	enum ObserveStatus {