Fix handling of streamable and convertible to string types

2019-11-25 16:46:33 -08:00
parent d19ed6716d
commit 0d07db1234
3 changed files with 25 additions and 15 deletions
--- a/include/fmt/core.h
+++ b/include/fmt/core.h
@@ -905,6 +905,8 @@ template <typename Context> struct arg_mapper {
  }
  template <typename T,
            FMT_ENABLE_IF(!is_string<T>::value && !is_char<T>::value &&
+                          !std::is_constructible<basic_string_view<char_type>,
+                                                 T>::value &&
                          (has_formatter<T, Context>::value ||
                           has_fallback_formatter<T, Context>::value))>
  FMT_CONSTEXPR const T& map(const T& val) {