Use std::uncaught_exceptions if possible

Additionally starts testing with C++17.

Author: zauguin

hdr/sqlite_modern_cpp.h

@@ -24,7 +24,8 @@
 
 #include <sqlite3.h>
 
-#include <sqlite_modern_cpp/utility/function_traits.h>
+#include "sqlite_modern_cpp/utility/function_traits.h"
+#include "sqlite_modern_cpp/utility/uncaught_exceptions.h"
 
 namespace sqlite {
 
@@ -160,6 +161,7 @@ namespace sqlite {
 	private:
 		std::shared_ptr<sqlite3> _db;
 		std::unique_ptr<sqlite3_stmt, decltype(&sqlite3_finalize)> _stmt;
+		utility::UncaughtExceptionDetector _has_uncaught_exception;
 
 		int _inx;
 
@@ -285,7 +287,7 @@ namespace sqlite {
 		~database_binder() noexcept(false) {
 			/* Will be executed if no >>op is found, but not if an exception
 			is in mid flight */
-			if(!execution_started && !std::uncaught_exception() && _stmt) {
+			if(!execution_started && !_has_uncaught_exception && _stmt) {
 				execute();
 			}
 		}

hdr/sqlite_modern_cpp/utility/uncaught_exceptions.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <cassert>
+#include <exception>
+#include <iostream>
+
+namespace sqlite {
+	namespace utility {
+#ifdef __cpp_lib_uncaught_exceptions
+		class UncaughtExceptionDetector {
+		public:
+			operator bool() {
+				return count != std::uncaught_exceptions();
+			}
+		private:
+			int count = std::uncaught_exceptions();
+		};
+#else
+		class UncaughtExceptionDetector {
+		public:
+			operator bool() {
+				return std::uncaught_exception();
+			}
+		};
+#endif
+	}
+}

tests/exception_dont_execute.cc

@@ -0,0 +1,20 @@
+#include <iostream>
+#include <string>
+#include <memory>
+#include <stdexcept>
+#include <sqlite_modern_cpp.h>
+using namespace sqlite;
+using namespace std;
+
+
+int main() {
+	database db(":memory:");
+	db << "CREATE TABLE person (id integer primary key not null, name TEXT not null);";
+
+	try {
+		auto stmt = db << "INSERT INTO person (id,name) VALUES (?,?)";
+		throw 1;
+	} catch (int) {
+	}
+	exit(EXIT_SUCCESS);
+}

tests/exception_dont_execute_nested.cc

@@ -0,0 +1,32 @@
+#include <iostream>
+#include <string>
+#include <memory>
+#include <stdexcept>
+#include <sqlite_modern_cpp.h>
+using namespace sqlite;
+using namespace std;
+
+struct A {
+	~A() {
+		database db(":memory:");
+		db << "CREATE TABLE person (id integer primary key not null, name TEXT not null);";
+
+		try {
+			auto stmt = db << "INSERT INTO person (id,name) VALUES (?,?)";
+			throw 1;
+		} catch (int) {
+		}
+	}
+};
+int main() {
+#ifdef __cpp_lib_uncaught_exceptions
+	try {
+		A a;
+		throw 1;
+	} catch(int) {
+	}
+	exit(EXIT_SUCCESS);
+#else
+	exit(42);
+#endif
+}

tests/std_optional.cc

@@ -70,6 +70,6 @@ int main() {
 #else
 #pragma message "<optional> not found, test disabled."
 int main() {
-	exit(EXIT_SUCCESS);
+	exit(42);
 }
 #endif