Fix handling of types convertible to std::string_view

2019-10-05 06:58:37 -07:00
parent 0571013709
commit 0c7650373c
2 changed files with 19 additions and 0 deletions
@@ -828,6 +828,14 @@ template <typename Context> struct arg_mapper {
  FMT_CONSTEXPR basic_string_view<char_type> map(const T& val) {
    return basic_string_view<char_type>(val);
  }
+  template <typename T,
+            FMT_ENABLE_IF(
+                std::is_constructible<std_string_view<char_type>, T>::value &&
+                !std::is_constructible<basic_string_view<char_type>, T>::value &&
+                !is_string<T>::value)>
+  FMT_CONSTEXPR basic_string_view<char_type> map(const T& val) {
+    return std_string_view<char_type>(val);
+  }
  FMT_CONSTEXPR const char* map(const signed char* val) {
    static_assert(std::is_same<char_type, char>::value, "invalid string type");
    return reinterpret_cast<const char*>(val);