Make friends with other classes

Author: mborland

include/boost/decimal/decimal128_t.hpp

@@ -98,6 +98,9 @@ constexpr auto to_chars_fixed_impl(char* first, char* last, const TargetDecimalT
 template <BOOST_DECIMAL_DECIMAL_FLOATING_TYPE TargetDecimalType>
 constexpr auto to_chars_hex_impl(char* first, char* last, const TargetDecimalType& value) noexcept -> to_chars_result;
 
+template <BOOST_DECIMAL_DECIMAL_FLOATING_TYPE TargetDecimalType>
+constexpr auto to_chars_cohort_preserving_scientific(char* first, char* last, const TargetDecimalType& value) noexcept -> to_chars_result;
+
 } //namespace detail
 
 BOOST_DECIMAL_EXPORT class decimal128_t final
@@ -205,6 +208,9 @@ BOOST_DECIMAL_EXPORT class decimal128_t final
     template <BOOST_DECIMAL_DECIMAL_FLOATING_TYPE TargetDecimalType>
     friend constexpr auto detail::to_chars_hex_impl(char* first, char* last, const TargetDecimalType& value) noexcept -> to_chars_result;
 
+    template <BOOST_DECIMAL_DECIMAL_FLOATING_TYPE TargetDecimalType>
+    friend constexpr auto detail::to_chars_cohort_preserving_scientific(char* first, char* last, const TargetDecimalType& value) noexcept -> to_chars_result;
+
     #if !defined(BOOST_DECIMAL_DISABLE_CLIB)
     constexpr decimal128_t(const char* str, std::size_t len);
     #endif

include/boost/decimal/decimal64_t.hpp

@@ -101,6 +101,9 @@ constexpr auto to_chars_fixed_impl(char* first, char* last, const TargetDecimalT
 template <BOOST_DECIMAL_DECIMAL_FLOATING_TYPE TargetDecimalType>
 constexpr auto to_chars_hex_impl(char* first, char* last, const TargetDecimalType& value) noexcept -> to_chars_result;
 
+template <BOOST_DECIMAL_DECIMAL_FLOATING_TYPE TargetDecimalType>
+constexpr auto to_chars_cohort_preserving_scientific(char* first, char* last, const TargetDecimalType& value) noexcept -> to_chars_result;
+
 template <bool checked, BOOST_DECIMAL_DECIMAL_FLOATING_TYPE T>
 constexpr auto d64_fma_impl(T x, T y, T z) noexcept -> T;
 
@@ -220,6 +223,9 @@ BOOST_DECIMAL_EXPORT class decimal64_t final
     template <BOOST_DECIMAL_DECIMAL_FLOATING_TYPE TargetDecimalType>
     friend constexpr auto detail::to_chars_hex_impl(char* first, char* last, const TargetDecimalType& value) noexcept -> to_chars_result;
 
+    template <BOOST_DECIMAL_DECIMAL_FLOATING_TYPE TargetDecimalType>
+    friend constexpr auto detail::to_chars_cohort_preserving_scientific(char* first, char* last, const TargetDecimalType& value) noexcept -> to_chars_result;
+
     template <bool checked, BOOST_DECIMAL_DECIMAL_FLOATING_TYPE T>
     friend constexpr auto detail::d64_fma_impl(T x, T y, T z) noexcept -> T;
 

test/test_to_chars_quantum.cpp

@@ -43,6 +43,8 @@ void test_to_chars_scientific()
 int main()
 {
     test_to_chars_scientific<decimal32_t>();
+    test_to_chars_scientific<decimal64_t>();
+    test_to_chars_scientific<decimal128_t>();
 
     return boost::report_errors();
 }