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accept() checks strings without copying them (#5978)

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Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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Niels Lohmann authored and GitHub committed 2026-11-01 17:22:58 +01:00
1 parent fb515ddc34
commit 517444b504
5 files changed
+265 -104
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include/nlohmann/json.hpp
+6 -5
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@@ -150,7 +150,7 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
// can be restored when json_pointer backwards compatibility is removed
// friend ::nlohmann::json_pointer<StringType>;
template<typename BasicJsonType, typename InputType>
template<typename BasicJsonType, typename InputType, bool DiscardValues>
friend class ::nlohmann::detail::parser;
friend ::nlohmann::detail::serializer<basic_json>;
template<typename BasicJsonType>
@@ -183,12 +183,11 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
detail::parser_callback_t<basic_json>cb = nullptr,
const bool allow_exceptions = true,
const bool ignore_comments = false,
const bool ignore_trailing_commas = false,
const bool discard_number_values = false
const bool ignore_trailing_commas = false
)
{
return ::nlohmann::detail::parser<basic_json, InputAdapterType>(std::move(adapter),
std::move(cb), allow_exceptions, ignore_comments, ignore_trailing_commas, discard_number_values);
std::move(cb), allow_exceptions, ignore_comments, ignore_trailing_commas);
}
private:
@@ -3117,7 +3116,9 @@ public:
const bool ignore_comments,
const bool ignore_trailing_commas)
{
return parser(std::forward<InputAdapterType>(adapter), nullptr, false, ignore_comments, ignore_trailing_commas, true).accept(true);
// the parser and lexer that discard the values of tokens (see lexer)
return ::nlohmann::detail::parser<basic_json, typename std::decay<InputAdapterType>::type, true>(std::forward<InputAdapterType>(adapter),
nullptr, false, ignore_comments, ignore_trailing_commas).accept(true);
}
/// generate SAX events from the input behind an already created adapter