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 6fe3cb366b24015ea215c127913db9f43ac42276..22b45e88c55eef60e433b6253d0070b77c9242a5 100644 (file)
--- 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;
 };