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✨ added overload for std::less<value_t> #486

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MSVC needs this overload to compile code containing a std::map that
uses nlohmann::detail::operator as key.
This commit is contained in:
Niels Lohmann 2017-03-11 15:44:14 +01:00
parent 758c4addc1
commit f4126e4dd8
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GPG Key ID: 7F3CEA63AE251B69
3 changed files with 39 additions and 0 deletions
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16
src/json.hpp
View File

@ -13025,6 +13025,22 @@ struct hash<nlohmann::json>
return h(j.dump());
}
};
/// specialization for std::less<value_t>
template <>
struct less<::nlohmann::detail::value_t>
{
/*!
@brief compare two value_t enum values
@since version 3.0.0
*/
bool operator()(nlohmann::detail::value_t lhs,
nlohmann::detail::value_t rhs) const noexcept
{
return nlohmann::detail::operator<(lhs, rhs);
}
};
} // namespace std
/*!

16
src/json.hpp.re2c
View File

@ -12059,6 +12059,22 @@ struct hash<nlohmann::json>
return h(j.dump());
}
};
/// specialization for std::less<value_t>
template <>
struct less<::nlohmann::detail::value_t>
{
/*!
@brief compare two value_t enum values
@since version 3.0.0
*/
bool operator()(nlohmann::detail::value_t lhs,
nlohmann::detail::value_t rhs) const noexcept
{
return nlohmann::detail::operator<(lhs, rhs);
}
};
} // namespace std
/*!

7
test/src/unit-regression.cpp
View File

@ -795,4 +795,11 @@ TEST_CASE("regression tests")
std::string s2 = j2.dump();
CHECK(s1 == s2);
}
SECTION("issue #486 - json::value_t can't be a map's key type in VC++ 2015")
{
// the code below must compile with MSVC
std::map<json::value_t, std::string> jsonTypes ;
jsonTypes[json::value_t::array] = "array";
}
}