Fix for issue fmtlib#3068

Signed-off-by: Vladislav Shchapov <[email protected]>
phprus · Sep 1, 2022 · f526e71 · f526e71
1 parent 40e414d
commit f526e71
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Showing 2 changed files with 5 additions and 1 deletion.
diff --git a/include/fmt/std.h b/include/fmt/std.h
@@ -104,7 +104,8 @@ using variant_index_sequence =
 template <typename T, typename U = void>
 struct is_variant_like_ : std::false_type {};
 template <typename T>
-struct is_variant_like_<T, std::void_t<decltype(std::variant_size<T>::value)>>
+struct is_variant_like_<
+    T, std::void_t<decltype(std::variant_size<std::remove_cv_t<T>>::value)>>
     : std::true_type {};
 
 // formattable element check

diff --git a/test/std-test.cc b/test/std-test.cc
@@ -75,5 +75,8 @@ TEST(std_test, variant) {
 
   EXPECT_EQ(fmt::format("{}", v4), "variant(monostate)");
   EXPECT_EQ(fmt::format("{}", v5), "variant(\"yes, this is variant\")");
+
+  volatile int i = 42;
+  EXPECT_EQ(fmt::format("{}", i), "42");
 #endif
 }