trailing types instead of return types

include/genimg/common.hh

@@ -7,9 +7,9 @@
 #include <string>
 #include <utility>
 
-[[nodiscard]] std::pair<cv::Mat, cv::Mat> init_image(
-    std::string const&) noexcept;
+[[nodiscard]] auto init_image(std::string const&) noexcept
+    -> std::pair<cv::Mat, cv::Mat>;
 
-[[nodiscard]] double euclidian_distance(cv::Mat const&, cv::Mat const&);
+[[nodiscard]] auto euclidian_distance(cv::Mat const&, cv::Mat const&) -> double;
 
 #endif /* GENETIC_IMAGE_INCLUDE_GENIMG_COMMON_HH_ */

include/genimg/parseargs.hh

@@ -4,8 +4,7 @@
 #include <filesystem>
 #include <tuple>
 
-[[nodiscard]] std::
-    tuple<std::filesystem::path, std::filesystem::path, int, int, bool>
-    parse_args(int, char**);
+[[nodiscard]] auto parse_args(int, char**)
+    -> std::tuple<std::filesystem::path, std::filesystem::path, int, int, bool>;
 
 #endif /* GENETIC_IMAGE_INCLUDE_GENIMG_PARSEARGS_HH_ */

src/common.cc

@@ -3,8 +3,8 @@
 #include <cmath>
 #include <cstdlib>
 
-[[nodiscard]] std::pair<cv::Mat, cv::Mat> init_image(
-    std::string const& t_input_file) noexcept
+[[nodiscard]] auto init_image(std::string const& t_input_file) noexcept
+    -> std::pair<cv::Mat, cv::Mat>
 {
 	cv::Mat input_image = cv::imread(t_input_file, cv::IMREAD_COLOR);
 	if (!input_image.data) {
@@ -19,8 +19,8 @@
 	return std::make_pair(std::move(input_image), process_image);
 }
 
-[[nodiscard]] double euclidian_distance(cv::Mat const& t_img1,
-                                        cv::Mat const& t_img2)
+[[nodiscard]] auto euclidian_distance(cv::Mat const& t_img1,
+                                      cv::Mat const& t_img2) -> double
 {
 	double euclidian = 0.0;
 	for (auto itr1 = t_img1.begin<uchar>(), itr2 = t_img2.begin<uchar>();

src/methods.cc

@@ -31,7 +31,7 @@ void adjustSize(cv::Mat const& t_process_img, cv::Point& t_top_left, int size)
 	}
 }
 
-[[nodiscard]] cv::Scalar randomColor()
+[[nodiscard]] auto randomColor() -> cv::Scalar
 {
 	static std::uniform_int_distribution<> dis(0, 255);
 	return cv::Scalar(rand() % 255, rand() % 255, rand() % 255);
@@ -60,12 +60,12 @@ void threadedGetColor(cv::Mat const& t_reference, ColorSet& t_colors, int t_h)
 	}
 }
 
-[[nodiscard]] ColorSet getColorSet(cv::Mat const& t_reference)
+[[nodiscard]] auto getColorSet(cv::Mat const& t_reference) -> ColorSet
 {
 	ColorSet res{};
 	for (int h = 0; h < t_reference.size().height; h += thread_nbr) {
 		std::vector<std::thread> thread_list{};
-		for (int i = 0; i < thread_nbr; ++i) {
+		for (auto i = 0u; i < thread_nbr; ++i) {
 			thread_list.push_back(std::thread(methods_private::threadedGetColor,
 			                                  std::ref(t_reference), std::ref(res),
 			                                  h + i));

src/parseargs.cc

@@ -21,8 +21,8 @@ void processFilenames(po::variables_map const& vm,
 	}
 }
 
-[[nodiscard]] std::tuple<path, path, int, int, bool> parse_args(int t_ac,
-                                                                char** t_av)
+[[nodiscard]] auto parse_args(int t_ac, char** t_av)
+    -> std::tuple<path, path, int, int, bool>
 {
 	po::options_description desc("Allowed options");
 	desc.add_options()("help,h", "Display this help message")(