MSVC2015 seems to need an explicit operator== for comparing against literal strings.

unvestigate · unvestigate · commit 2a1e581b6bb4 · 2020-03-19T12:30:56.000+02:00
diff --git a/include/behaviortree_cpp_v3/utils/string_view.hpp b/include/behaviortree_cpp_v3/utils/string_view.hpp
@@ -891,6 +891,14 @@ nssv_constexpr bool operator== (
     basic_string_view <CharT, Traits> rhs ) nssv_noexcept
 { return lhs.compare( rhs ) == 0 ; }
 
+template< class CharT, class Traits >
+nssv_constexpr bool operator== (
+    basic_string_view <CharT, Traits> lhs,
+    CharT const * rhs) nssv_noexcept
+{
+    return lhs.compare(rhs) == 0;
+}
+
 template< class CharT, class Traits >
 nssv_constexpr bool operator!= (
     basic_string_view <CharT, Traits> lhs,
