eldritch horrors
c208e918e5
This allows templates such as `NLOHMANN_DEFINE_TYPE_*` templates and other generators with things like `std::vector<std::optional<T>>`.
Co-authored-by: John Ericson <John.Ericson@Obsidian.Systems>
(cherry picked from commit 02bd821f2e71372d31bbe6700bd68086cc2ee70a)
Change-Id: I8b0ebcf2af4226610dadd565962f2d2327415a03
59 lines
1.6 KiB
C++
59 lines
1.6 KiB
C++
#include <vector>
|
|
#include <optional>
|
|
|
|
#include <gtest/gtest.h>
|
|
|
|
#include "json-utils.hh"
|
|
|
|
namespace nix {
|
|
|
|
/* Test `to_json` and `from_json` with `std::optional` types.
|
|
* We are specifically interested in whether we can _nest_ optionals in STL
|
|
* containers so we that we can leverage existing adl_serializer templates. */
|
|
|
|
TEST(to_json, optionalInt) {
|
|
std::optional<int> val = std::make_optional(420);
|
|
ASSERT_EQ(nlohmann::json(val), nlohmann::json(420));
|
|
val = std::nullopt;
|
|
ASSERT_EQ(nlohmann::json(val), nlohmann::json(nullptr));
|
|
}
|
|
|
|
TEST(to_json, vectorOfOptionalInts) {
|
|
std::vector<std::optional<int>> vals = {
|
|
std::make_optional(420),
|
|
std::nullopt,
|
|
};
|
|
ASSERT_EQ(nlohmann::json(vals), nlohmann::json::parse("[420,null]"));
|
|
}
|
|
|
|
TEST(to_json, optionalVectorOfInts) {
|
|
std::optional<std::vector<int>> val = std::make_optional(std::vector<int> {
|
|
-420,
|
|
420,
|
|
});
|
|
ASSERT_EQ(nlohmann::json(val), nlohmann::json::parse("[-420,420]"));
|
|
val = std::nullopt;
|
|
ASSERT_EQ(nlohmann::json(val), nlohmann::json(nullptr));
|
|
}
|
|
|
|
TEST(from_json, optionalInt) {
|
|
nlohmann::json json = 420;
|
|
std::optional<int> val = json;
|
|
ASSERT_TRUE(val.has_value());
|
|
ASSERT_EQ(*val, 420);
|
|
json = nullptr;
|
|
json.get_to(val);
|
|
ASSERT_FALSE(val.has_value());
|
|
}
|
|
|
|
TEST(from_json, vectorOfOptionalInts) {
|
|
nlohmann::json json = { 420, nullptr };
|
|
std::vector<std::optional<int>> vals = json;
|
|
ASSERT_EQ(vals.size(), 2);
|
|
ASSERT_TRUE(vals.at(0).has_value());
|
|
ASSERT_EQ(*vals.at(0), 420);
|
|
ASSERT_FALSE(vals.at(1).has_value());
|
|
}
|
|
|
|
} /* namespace nix */
|