Test for std::optional

Author: zauguin

tests/std_optional.cc

@@ -0,0 +1,68 @@
+#include <unistd.h>
+#include <iostream>
+
+#include <sqlite_modern_cpp.h>
+
+using namespace sqlite;
+using namespace std;
+
+void insert(database& db, bool is_null) {
+	int id = 1;
+	std::optional<int> val;
+	if(!is_null) val = 5;
+
+	db << "delete from test where id = 1";
+	db << "insert into test(id,val) values(?,?)" << id << val;
+}
+
+void select(database& db, bool should_be_null) {
+	db << "select id,val from test" >> [&](long long, std::optional<int> val) {
+		if(should_be_null) {
+			if(val) exit(EXIT_FAILURE);
+		} else {
+			if(!val) exit(EXIT_FAILURE);
+		}
+	};
+}
+
+struct TmpFile {
+	string fname;
+
+	TmpFile() {
+		char f[] = "/tmp/sqlite_modern_cpp_test_XXXXXX";
+		int fid = mkstemp(f);
+		close(fid);
+
+		fname = f;
+	}
+
+	~TmpFile() {
+		unlink(fname.c_str());
+	}
+};
+
+int main() {
+	try {
+		// creates a database file 'dbfile.db' if it does not exists.
+		TmpFile file;
+		database db(file.fname);
+
+		db << "drop table if exists test";
+		db <<
+			"create table if not exists test ("
+			"   id integer primary key,"
+			"   val int"
+			");";
+
+		insert(db, true);
+		select(db, true);
+
+		insert(db, false);
+		select(db, false);
+
+	} catch(exception& e) {
+		cout << e.what() << endl;
+		exit(EXIT_FAILURE);
+	}
+	exit(EXIT_SUCCESS);
+}