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Minor tweak in the sfinae for the output function

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Emil Dotchevski
2026-01-31 23:14:48 -05:00
parent 8f5f359109
commit 8dc99701f0
2 changed files with 19 additions and 14 deletions
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doc/exception.adoc
+16 -11
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@@ -1084,8 +1084,9 @@ struct boost_json_encoder
{
boost::json::value & v_;
// Enabled if x is assignable to boost::json::value, or
// if tag_invoke is defined for boost::json::value_from_tag.
// Uses unspecified SFINAE expression designed to make the
// overload selected only if no other compatible overload is found.
// Implemented in terms of boost::json::value_from.
template <class T>
friend void output( boost_json_encoder &, T const & x );
@@ -1114,7 +1115,9 @@ struct nlohmann_json_encoder
{
Json & j_;
// Enabled if to_json is available for Json and T.
// Uses unspecified SFINAE expression designed to make the
// overload selected only if no other compatible overload is found.
// Implemented in terms of to_json.
template <class T>
friend void output( nlohmann_json_encoder &, T const & x );
@@ -1156,8 +1159,9 @@ struct boost_json_encoder
{
boost::json::value & v_;
// Enabled if x is assignable to boost::json::value, or
// if tag_invoke is defined for boost::json::value_from_tag.
// Uses unspecified SFINAE expression designed to make the
// overload selected only if no other compatible overload is found.
// Implemented in terms of boost::json::value_from.
template <class T>
friend void output( boost_json_encoder &, T const & x );
@@ -1168,10 +1172,7 @@ struct boost_json_encoder
} }
----
The `boost_json_encoder` type serializes objects to JSON format using https://www.boost.org/doc/libs/release/libs/json/[Boost.JSON]. The `output` function is enabled for:
* Types directly assignable to `boost::json::value`
* Types for which a `tag_invoke` overload for `value_from_tag` can be found via ADL
The `boost_json_encoder` type serializes objects to JSON format using https://www.boost.org/doc/libs/release/libs/json/[Boost.JSON]. The `output` function is implemented in terms of `boost::json::value_from`.
See <<tutorial_serialization>>.
@@ -1592,7 +1593,9 @@ struct nlohmann_json_encoder
{
Json & j_;
// Enabled if to_json is available for Json and T.
// Uses unspecified SFINAE expression designed to make the
// overload selected only if no other compatible overload is found.
// Implemented in terms of to_json.
template <class T>
friend void output( nlohmann_json_encoder &, T const & x );
@@ -1603,7 +1606,9 @@ struct nlohmann_json_encoder
} }
----
The `nlohmann_json_encoder` type serializes objects to JSON format based on ADL calls to `to_json`. This is compatible with https://github.com/nlohmann/json[nlohmann/json]. See <<tutorial_serialization>>.
The `nlohmann_json_encoder` type serializes objects to JSON format based on ADL calls to `to_json`. This is compatible with https://github.com/nlohmann/json[nlohmann/json].
See <<tutorial_serialization>>.
'''
include/boost/exception/serialization/nlohmann_json_encoder.hpp
+3 -3
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@@ -22,11 +22,11 @@ boost
Json & j_;
template <class Encoder, class T, class... Deprioritize>
friend
typename std::enable_if<std::is_same<Encoder, nlohmann_json_encoder>::value>::type
output(Encoder & e, T const & x, Json * = 0, Deprioritize...)
friend typename std::enable_if<std::is_same<Encoder, nlohmann_json_encoder>::value, Json *>::type
output(Encoder & e, T const & x, Deprioritize...)
{
to_json(e.j_, x);
return 0;
}
template <class T>