From: Mikko Rasa <tdb@tdb.fi>
Date: Mon, 3 Jun 2019 11:50:39 +0000 (+0300)
Subject: Fix formatted output operator detection in lexicalcast.h
X-Git-Url: http://git.tdb.fi/?a=commitdiff_plain;h=4f04dc8e2dcb48d524c141cb14ce05b655608454;p=libs%2Fcore.git

Fix formatted output operator detection in lexicalcast.h

Since it was using a default-constructed value as part of the test
expression, it would fail to detect the operator for classes that are
not default-constructable.
---

diff --git a/source/strings/lexicalcast.h b/source/strings/lexicalcast.h
index 6fe3cb3..22b45e8 100644
--- a/source/strings/lexicalcast.h
+++ b/source/strings/lexicalcast.h
@@ -97,7 +97,7 @@ struct CheckFormattedOutput: Sfinae
 {
 	static std::ostream &s;
 	template<typename T>
-	static Yes f(int (*)[sizeof(s<<T())]);
+	static Yes f(int (*)[sizeof(s<<reinterpret_cast<const T &>(s))]);
 	using Sfinae::f;
 };