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Provide a from_json overload for std::map

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This overload is chosen only when BasicJsonType::string_t
is not constructible from std::map::key_type.

Currently, converting a map to json treats it as an array of pairs.

fixes #1079
This commit is contained in:
Théo DELRIEU
2018-05-14 11:51:37 +02:00
parent 567fe9b7a0
commit c5e63fd684
3 changed files with 61 additions and 0 deletions
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21
test/src/unit-conversions.cpp
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@ -1079,6 +1079,26 @@ TEST_CASE("value conversion")
j5.get<std::unordered_set<std::string>>();
}
SECTION("std::map (array of pairs)")
{
std::map<int, int> m{{0, 1}, {1, 2}, {2, 3}};
json j6 = m;
auto m2 = j6.get<std::map<int, int>>();
CHECK(m == m2);
json j7 = {0, 1, 2, 3};
CHECK_THROWS_AS((j7.get<std::map<int, int>>()), json::type_error&);
CHECK_THROWS_WITH((j7.get<std::map<int, int>>()), "[json.exception.type_error.302] type must be array, but is number");
SECTION("superfluous entries")
{
json j8 = {{0, 1, 2}, {1, 2, 3}, {2, 3, 4}};
m2 = j8.get<std::map<int, int>>();
CHECK(m == m2);
}
}
SECTION("exception in case of a non-object type")
{
CHECK_THROWS_AS((json().get<std::list<int>>()), json::type_error&);
@ -1094,6 +1114,7 @@ TEST_CASE("value conversion")
CHECK_THROWS_WITH((json().get<std::vector<json>>()), "[json.exception.type_error.302] type must be array, but is null");
CHECK_THROWS_WITH((json().get<std::list<json>>()), "[json.exception.type_error.302] type must be array, but is null");
CHECK_THROWS_WITH((json().get<std::valarray<int>>()), "[json.exception.type_error.302] type must be array, but is null");
CHECK_THROWS_WITH((json().get<std::map<int, int>>()), "[json.exception.type_error.302] type must be array, but is null");
}
}
}