Charconv is used to serialize doubles

Author: grisumbras

CMakeLists.txt

@@ -89,6 +89,7 @@ function(boost_json_setup_properties target)
     target_link_libraries(${target}
         PUBLIC
             Boost::assert
+            Boost::charconv
             Boost::config
             Boost::container
             Boost::container_hash

build.jam

@@ -12,6 +12,7 @@ using boost-pretty-printers ;
 
 constant boost_dependencies :
     /boost/assert//boost_assert
+    /boost/charconv//boost_charconv
     /boost/config//boost_config
     /boost/container//boost_container
     /boost/container_hash//boost_container_hash

build/Jamfile

@@ -70,6 +70,7 @@ project
       <toolset>msvc:<define>_SCL_SECURE_NO_WARNINGS
     : usage-requirements
       <library>/boost/container//boost_container/<warnings-as-errors>off
+      <library>/boost/charconv//boost_charconv/<warnings-as-errors>off
       <define>BOOST_JSON_NO_LIB=1
     : source-location ../src
     ;

include/boost/json/detail/format.hpp

@@ -10,16 +10,15 @@
 #ifndef BOOST_JSON_DETAIL_FORMAT_HPP
 #define BOOST_JSON_DETAIL_FORMAT_HPP
 
+#include <boost/charconv/limits.hpp>
+
 namespace boost {
 namespace json {
 namespace detail {
 
-int constexpr max_number_chars =
-     1 +    // '-'
-    19 +    // unsigned 64-bit mantissa
-     1 +    // 'e'
-     1 +    // '-'
-     5;     // unsigned 16-bit exponent
+constexpr
+std::size_t
+max_number_chars = boost::charconv::limits<double>::max_chars;
 
 BOOST_JSON_DECL
 unsigned
@@ -32,11 +31,6 @@ unsigned
 format_int64(
     char* dest, int64_t i) noexcept;
 
-BOOST_JSON_DECL
-unsigned
-format_double(
-    char* dest, double d, bool allow_infinity_and_nan = false) noexcept;
-
 } // detail
 } // namespace json
 } // namespace boost

include/boost/json/detail/impl/format.ipp

@@ -11,7 +11,7 @@
 #ifndef BOOST_JSON_DETAIL_IMPL_FORMAT_IPP
 #define BOOST_JSON_DETAIL_IMPL_FORMAT_IPP
 
-#include <boost/json/detail/ryu/ryu.hpp>
+#include <cmath>
 #include <cstring>
 
 namespace boost {
@@ -110,14 +110,6 @@ format_int64(
     return 1 + format_uint64(dest, ui);
 }
 
-unsigned
-format_double(
-    char* dest, double d, bool allow_infinity_and_nan) noexcept
-{
-    return static_cast<int>(
-        ryu::d2s_buffered_n(d, dest, allow_infinity_and_nan));
-}
-
 } // detail
 } // namespace json
 } // namespace boost