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add from_json support for std::array

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Théo DELRIEU 2017-06-19 12:03:38 +02:00
parent 6e4910d5c5
commit 08d781058c
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GPG key ID: C64D5E244E08ADC6
2 changed files with 16 additions and 3 deletions
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11
src/json.hpp
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@ -1063,6 +1063,15 @@ auto from_json_array_impl(const BasicJsonType& j, CompatibleArrayType& arr, prio
}); });
} }
template <typename BasicJsonType, typename T, std::size_t N>
void from_json_array_impl(const BasicJsonType& j, std::array<T, N>& arr, priority_tag<2>)
{
for (std::size_t i = 0; i < N; ++i)
{
arr[i] = j.at(i).template get<T>();
}
}
template<typename BasicJsonType, typename CompatibleArrayType, template<typename BasicJsonType, typename CompatibleArrayType,
enable_if_t<is_compatible_array_type<BasicJsonType, CompatibleArrayType>::value and enable_if_t<is_compatible_array_type<BasicJsonType, CompatibleArrayType>::value and
std::is_convertible<BasicJsonType, typename CompatibleArrayType::value_type>::value and std::is_convertible<BasicJsonType, typename CompatibleArrayType::value_type>::value and
@ -1074,7 +1083,7 @@ void from_json(const BasicJsonType& j, CompatibleArrayType& arr)
JSON_THROW(type_error::create(302, "type must be array, but is " + j.type_name())); JSON_THROW(type_error::create(302, "type must be array, but is " + j.type_name()));
} }
from_json_array_impl(j, arr, priority_tag<1> {}); from_json_array_impl(j, arr, priority_tag<2> {});
} }
template<typename BasicJsonType, typename CompatibleObjectType, template<typename BasicJsonType, typename CompatibleObjectType,

8
test/src/unit-constructor1.cpp
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@ -283,12 +283,13 @@ TEST_CASE("constructors")
CHECK(std::get<2>(t) == j[2]); CHECK(std::get<2>(t) == j[2]);
} }
SECTION("std::pair/tuple failures") SECTION("std::pair/tuple/array failures")
{ {
json j{1}; json j{1};
CHECK_THROWS((j.get<std::pair<int, int>>())); CHECK_THROWS((j.get<std::pair<int, int>>()));
CHECK_THROWS((j.get<std::tuple<int, int>>())); CHECK_THROWS((j.get<std::tuple<int, int>>()));
CHECK_THROWS((j.get<std::array<int, 3>>()));
} }
SECTION("std::forward_list<json>") SECTION("std::forward_list<json>")
@ -299,12 +300,15 @@ TEST_CASE("constructors")
CHECK(j == j_reference); CHECK(j == j_reference);
} }
SECTION("std::array<json, 5>") SECTION("std::array<json, 6>")
{ {
std::array<json, 6> a {{json(1), json(1u), json(2.2), json(false), json("string"), json()}}; std::array<json, 6> a {{json(1), json(1u), json(2.2), json(false), json("string"), json()}};
json j(a); json j(a);
CHECK(j.type() == json::value_t::array); CHECK(j.type() == json::value_t::array);
CHECK(j == j_reference); CHECK(j == j_reference);
const auto a2 = j.get<std::array<json, 6>>();
CHECK(a2 == a);
} }
SECTION("std::vector<json>") SECTION("std::vector<json>")