Cleanup exception stacktraces, so the compile the same on Windows.

Stacktraces still appear to be empty on Windows, but that's an issue for a later day.

src/Exception.hpp

@@ -9,12 +9,10 @@
 #include <source_location>
 #endif
 
-#if !WINDOWS
-#if PRETTYTRACES
-#define BACKWARD_HAS_BFD 1
+#if PRETTYTRACES && !WINDOWS
+#define BACKWARD_HAS_DW 1
 #endif
 #include <backward.hpp>
-#endif
 
 #if defined(__clang__)
 namespace std {
@@ -35,35 +33,24 @@ static constexpr const char* file_name(const char* path) {
 namespace ArbUt {
     /// @brief Implementation of std::logic_error that gives a stack trace when thrown.
     class Exception : std::logic_error {
-#if !WINDOWS
         backward::StackTrace _stack;
-#endif
 
     public:
         /// @brief Throw an exception with specified message.
-        explicit Exception(const std::string& msg) : std::logic_error(msg) {
-#if !WINDOWS
+        explicit Exception(const std::string& msg) : std::logic_error(msg), _stack({}) {
             _stack.load_here(32);
 #if DEBUG
             _stack.skip_n_firsts(2);
 #else
             _stack.skip_n_firsts(0);
-#endif
 #endif
         }
 
         /// @brief Copy operator.
-        Exception(const Exception& e) noexcept
-            : std::logic_error(e.what())
-#if !WINDOWS
-              ,
-              _stack(e._stack)
-#endif
-        {
-        }
+        Exception(const Exception& e) noexcept : std::logic_error(e.what()), _stack(e._stack) {}
         template <typename... Args>
-        /// @brief Throw a nicely formatted exception. The exception message will have the file name, line number, message,
-        /// along with any optional parameters passed.
+        /// @brief Throw a nicely formatted exception. The exception message will have the file name, line number,
+        /// message, along with any optional parameters passed.
         [[noreturn]] static void Throw(const std::string& expression, const std::source_location& location,
                                        const Args... args) {
             std::stringstream error;
@@ -86,14 +73,9 @@ namespace ArbUt {
         /// retrieved.
         [[nodiscard]] std::string GetStacktrace([[maybe_unused]] size_t depth = 6,
                                                 [[maybe_unused]] bool include_addr = true) const {
-#if !WINDOWS
             return BuildStacktraceFromStack(_stack, depth, include_addr);
-#else
-            return "Stack trace not available on Windows.";
-#endif
         }
 
-#if !WINDOWS
         /// @brief Builds a string from a given stack.
         /// @param stack The stack to build the string from.
         /// @param depth The max number of stacks it should retrieve.
@@ -170,7 +152,6 @@ namespace ArbUt {
 
             ss << fileName << "[" << source.line << "] " << snippet << std::endl;
         }
-#endif
     };
 }