+template <typename T>
+Expected<T, ConversionCode> str_to_floating(StringPiece* src) noexcept;
+
+extern template Expected<float, ConversionCode> str_to_floating<float>(
+ StringPiece* src) noexcept;
+extern template Expected<double, ConversionCode> str_to_floating<double>(
+ StringPiece* src) noexcept;
+
+template <class Tgt>
+Expected<Tgt, ConversionCode> digits_to(const char* b, const char* e) noexcept;
+
+extern template Expected<char, ConversionCode> digits_to<char>(
+ const char*,
+ const char*) noexcept;
+extern template Expected<signed char, ConversionCode> digits_to<signed char>(
+ const char*,
+ const char*) noexcept;
+extern template Expected<unsigned char, ConversionCode>
+digits_to<unsigned char>(const char*, const char*) noexcept;
+
+extern template Expected<short, ConversionCode> digits_to<short>(
+ const char*,
+ const char*) noexcept;
+extern template Expected<unsigned short, ConversionCode>
+digits_to<unsigned short>(const char*, const char*) noexcept;
+
+extern template Expected<int, ConversionCode> digits_to<int>(
+ const char*,
+ const char*) noexcept;
+extern template Expected<unsigned int, ConversionCode> digits_to<unsigned int>(
+ const char*,
+ const char*) noexcept;
+
+extern template Expected<long, ConversionCode> digits_to<long>(
+ const char*,
+ const char*) noexcept;
+extern template Expected<unsigned long, ConversionCode>
+digits_to<unsigned long>(const char*, const char*) noexcept;
+
+extern template Expected<long long, ConversionCode> digits_to<long long>(
+ const char*,
+ const char*) noexcept;
+extern template Expected<unsigned long long, ConversionCode>
+digits_to<unsigned long long>(const char*, const char*) noexcept;
+
+#if FOLLY_HAVE_INT128_T
+extern template Expected<__int128, ConversionCode> digits_to<__int128>(
+ const char*,
+ const char*) noexcept;
+extern template Expected<unsigned __int128, ConversionCode>
+digits_to<unsigned __int128>(const char*, const char*) noexcept;
+#endif
+
+template <class T>
+Expected<T, ConversionCode> str_to_integral(StringPiece* src) noexcept;
+
+extern template Expected<char, ConversionCode> str_to_integral<char>(
+ StringPiece* src) noexcept;
+extern template Expected<signed char, ConversionCode>
+str_to_integral<signed char>(StringPiece* src) noexcept;
+extern template Expected<unsigned char, ConversionCode>
+str_to_integral<unsigned char>(StringPiece* src) noexcept;
+
+extern template Expected<short, ConversionCode> str_to_integral<short>(
+ StringPiece* src) noexcept;
+extern template Expected<unsigned short, ConversionCode>
+str_to_integral<unsigned short>(StringPiece* src) noexcept;
+
+extern template Expected<int, ConversionCode> str_to_integral<int>(
+ StringPiece* src) noexcept;
+extern template Expected<unsigned int, ConversionCode>
+str_to_integral<unsigned int>(StringPiece* src) noexcept;
+
+extern template Expected<long, ConversionCode> str_to_integral<long>(
+ StringPiece* src) noexcept;
+extern template Expected<unsigned long, ConversionCode>
+str_to_integral<unsigned long>(StringPiece* src) noexcept;
+
+extern template Expected<long long, ConversionCode> str_to_integral<long long>(
+ StringPiece* src) noexcept;
+extern template Expected<unsigned long long, ConversionCode>
+str_to_integral<unsigned long long>(StringPiece* src) noexcept;