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Write doubles from their bits only where double is IEEE 754 binary64

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Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann committed 2026-10-10 11:05:12 +02:00
1 parent 749ba78543
commit d339a714ce
2 files changed
+8 -4
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include/nlohmann/detail/view/serializer.hpp
+4 -2
View File
@@ -257,6 +257,8 @@ class view_serializer
using nav = navigation<Editable>; using nav = navigation<Editable>;
using string_t = typename BasicJsonType::string_t; using string_t = typename BasicJsonType::string_t;
using number_float_t = typename BasicJsonType::number_float_t; using number_float_t = typename BasicJsonType::number_float_t;
/// doubles that are IEEE 754 binary64 are written from their bits (Zmij)
using fast_double = std::integral_constant < bool, std::is_same<number_float_t, double>::value && ::nlohmann::detail::dtoa_impl::is_binary64<double>::value >;
public: public:
view_serializer(const document_data& d, string_t& out, std::size_t estimate, const dump_style& style) view_serializer(const document_data& d, string_t& out, std::size_t estimate, const dump_style& style)
@@ -526,7 +528,7 @@ class view_serializer
room(n->len); room(n->len);
copy(src + n->off, n->len); copy(src + n->off, n->len);
} }
else if (enabled(std::is_same<number_float_t, double>::value)) else if (enabled(fast_double::value))
{ {
room(64); room(64);
w = write_double_at(w, *n); w = write_double_at(w, *n);
@@ -716,7 +718,7 @@ class view_serializer
/// a float node as dump() writes it /// a float node as dump() writes it
void write_float_node(const node& n) void write_float_node(const node& n)
{ {
write_float_node(n, std::is_same<number_float_t, double> {}); write_float_node(n, fast_double {});
} }
void write_float_node(const node& n, std::false_type /*other*/) void write_float_node(const node& n, std::false_type /*other*/)
single_include/nlohmann/json_view.hpp
+4 -2
View File
@@ -6072,6 +6072,8 @@ class view_serializer
using nav = navigation<Editable>; using nav = navigation<Editable>;
using string_t = typename BasicJsonType::string_t; using string_t = typename BasicJsonType::string_t;
using number_float_t = typename BasicJsonType::number_float_t; using number_float_t = typename BasicJsonType::number_float_t;
/// doubles that are IEEE 754 binary64 are written from their bits (Zmij)
using fast_double = std::integral_constant < bool, std::is_same<number_float_t, double>::value && ::nlohmann::detail::dtoa_impl::is_binary64<double>::value >;
public: public:
view_serializer(const document_data& d, string_t& out, std::size_t estimate, const dump_style& style) view_serializer(const document_data& d, string_t& out, std::size_t estimate, const dump_style& style)
@@ -6341,7 +6343,7 @@ class view_serializer
room(n->len); room(n->len);
copy(src + n->off, n->len); copy(src + n->off, n->len);
} }
else if (enabled(std::is_same<number_float_t, double>::value)) else if (enabled(fast_double::value))
{ {
room(64); room(64);
w = write_double_at(w, *n); w = write_double_at(w, *n);
@@ -6531,7 +6533,7 @@ class view_serializer
/// a float node as dump() writes it /// a float node as dump() writes it
void write_float_node(const node& n) void write_float_node(const node& n)
{ {
write_float_node(n, std::is_same<number_float_t, double> {}); write_float_node(n, fast_double {});
} }
void write_float_node(const node& n, std::false_type /*other*/) void write_float_node(const node& n, std::false_type /*other*/)