From ef89db97d3acf1b3573ff6097ff8eb4288c845da Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 8 Oct 2023 17:23:41 +0100
Subject: Simplify checkResult

Becomes template for however many acceptable status there are and tests
as a fold expression.
---
 libpqpp/pq-connection.cpp | 11 +++--------
 libpqpp/pq-connection.h   |  6 ++----
 2 files changed, 5 insertions(+), 12 deletions(-)

diff --git a/libpqpp/pq-connection.cpp b/libpqpp/pq-connection.cpp
index dc3cf13..ed00d8d 100644
--- a/libpqpp/pq-connection.cpp
+++ b/libpqpp/pq-connection.cpp
@@ -124,16 +124,11 @@ PQ::Connection::modify(const std::string & sql, const DB::CommandOptionsCPtr & o
 	return std::make_shared<ModifyCommand>(this, sql, opts);
 }
 
-bool
-PQ::Connection::checkResultInt(PGresult * res, int expected, int alt)
-{
-	return (PQresultStatus(res) == expected) || (alt != -1 && (PQresultStatus(res) == alt));
-}
-
+template<std::same_as<ExecStatusType>... Expected>
 PQ::ResultPtr
-PQ::Connection::checkResult(PGresult * res, int expected, int alt) const
+PQ::Connection::checkResult(PGresult * res, Expected... expected) const
 {
-	if (!checkResultInt(res, expected, alt)) {
+	if (const auto status = PQresultStatus(res); (... && (status != expected))) {
 		PQclear(res);
 		throw Error(conn);
 	}
diff --git a/libpqpp/pq-connection.h b/libpqpp/pq-connection.h
index af013ab..39f7f2a 100644
--- a/libpqpp/pq-connection.h
+++ b/libpqpp/pq-connection.h
@@ -47,13 +47,11 @@ namespace PQ {
 		void endBulkUpload(const char *) override;
 		size_t bulkUploadData(const char *, size_t) const override;
 
-		ResultPtr checkResult(PGresult * res, int expected, int alternative = -1) const;
+		template<std::same_as<ExecStatusType>... Expected>
+		ResultPtr checkResult(PGresult * res, Expected... expected) const;
 
 		PGconn * conn;
 		mutable PreparedStatements preparedStatements;
-
-	private:
-		static bool checkResultInt(PGresult * res, int expected, int alternative);
 	};
 }
 
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