Improve error handling.

1 files changed, 32 insertions, 0 deletions

diff --git a/c/err.h b/c/err.h
index d4a9976..4c6e829 100644
--- a/c/err.h
+++ b/c/err.h
@@ -4,6 +4,8 @@
 #include <exception>
 #include <string>
 
+#include "win32.h"
+
 enum ErrType : unsigned char
 {
 	GENERIC,
@@ -22,4 +24,34 @@ struct Err
 /* Return a wide string describing exception. */
 std::wstring What(std::exception_ptr e = std::current_exception());
 
+/* Exit gracefully on uncaught exception. */
+void OnTerminate();
+
+/* Exception-catching version of F that warns on exception. */
+template <auto F>
+auto Except = (decltype(F))[](auto... xs)
+{
+	try {
+		return F(xs...);
+	} catch (...) {
+		EBMessageBox(What(), L"Error");
+		if constexpr (!std::is_same_v<decltype(F(xs...)), void>)
+			return decltype(F(xs...)){};
+	}
+};
+
+/* Exception-catching version of F that exits on exception. */
+template <auto F>
+auto Noexcept = (decltype(F))[](auto... xs)
+{
+	try {
+		return F(xs...);
+	} catch (...) {
+		EBMessageBox(What(), L"Fatal Error", MB_ICONERROR);
+		exit(1);
+		if constexpr (!std::is_same_v<decltype(F(xs...)), void>)
+			return decltype(F(xs...)){};
+	}
+};
+
 #endif