FTL: Allow Concat of bool and char
Also, allow references to integral types.
Bug: 185536303
Test: ftl_test
Change-Id: Ic9be008ed7f72ecdb7a369b01bc5a8235b35ac2c
diff --git a/include/ftl/concat.h b/include/ftl/concat.h
index ded48f7..e0774d3 100644
--- a/include/ftl/concat.h
+++ b/include/ftl/concat.h
@@ -20,7 +20,9 @@
namespace android::ftl {
-// Lightweight (not allocating nor sprintf-based) concatenation.
+// Lightweight (not allocating nor sprintf-based) concatenation. The variadic arguments can be
+// values of integral type (including bool and char), string literals, or strings whose length
+// is constrained:
//
// std::string_view name = "Volume";
// ftl::Concat string(ftl::truncated<3>(name), ": ", -3, " dB");