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add first version support for user-defined types
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Théo Delrieu
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Théo DELRIEU
Théo DELRIEU
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302
test/src/unit-constructor3.cpp
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302
test/src/unit-constructor3.cpp
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/*
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__ _____ _____ _____
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__| | __| | | | JSON for Modern C++ (test suite)
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| | |__ | | | | | | version 2.0.5
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|_____|_____|_____|_|___| https://github.com/nlohmann/json
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Licensed under the MIT License <http://opensource.org/licenses/MIT>.
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Copyright (c) 2013-2016 Niels Lohmann <http://nlohmann.me>.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#include <string>
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#include <memory>
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#include "catch.hpp"
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#include "json.hpp"
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using nlohmann::json;
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namespace udt
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{
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struct empty_type {};
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struct pod_type {
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int a;
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char b;
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short c;
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};
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inline bool operator==(pod_type const& lhs, pod_type const& rhs) noexcept
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{
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return std::tie(lhs.a, lhs.b, lhs.c) == std::tie(rhs.a, rhs.b, rhs.c);
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}
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struct bit_more_complex_type {
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pod_type a;
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pod_type b;
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std::string c;
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};
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inline bool operator==(bit_more_complex_type const &lhs,
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bit_more_complex_type const &rhs) noexcept {
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return std::tie(lhs.a, lhs.b, lhs.c) == std::tie(rhs.a, rhs.b, rhs.c);
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}
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// best optional implementation ever
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template <typename T>
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class optional_type
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{
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public:
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optional_type() = default;
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explicit optional_type(T val) : _val(std::make_shared<T>(std::move(val))) {}
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explicit operator bool() const noexcept { return _val != nullptr; }
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T const &operator*() const { return *_val; }
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private:
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std::shared_ptr<T> _val;
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};
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template <typename T>
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inline bool operator==(optional_type<T> const& lhs, optional_type<T> const& rhs)
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{
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if (!lhs && !rhs)
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return true;
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if (!lhs || !rhs)
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return false;
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return *lhs == *rhs;
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}
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}
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namespace nlohmann
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{
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template <>
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struct json_traits<udt::empty_type>
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{
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using type = udt::empty_type;
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static json to_json(type)
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{
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return json::object();
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}
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static type from_json(json const& j)
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{
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assert(j.is_object() and j.empty());
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return {};
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}
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};
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template <>
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struct json_traits<udt::pod_type>
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{
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using type = udt::pod_type;
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static json to_json(type const& t)
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{
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return {{"a", t.a}, {"b", t.b}, {"c", t.c}};
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}
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static type from_json(json const& j)
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{
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assert(j.is_object());
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return {j["a"].get<int>(), j["b"].get<char>(), j["c"].get<short>()};
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}
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};
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template <>
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struct json_traits<udt::bit_more_complex_type>
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{
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using type = udt::bit_more_complex_type;
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static json to_json(type const& t)
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{
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return json{{"a", json{t.a}}, {"b", json{t.b}}, {"c", t.c}};
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}
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static type from_json(json const& j)
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{
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return {j["a"].get<udt::pod_type>(), j["b"].get<udt::pod_type>(),
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j["c"].get<std::string>()};
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}
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};
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template <typename T>
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struct json_traits<udt::optional_type<T>>
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{
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using type = udt::optional_type<T>;
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static json to_json(type const& t)
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{
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if (t)
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return json(*t);
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return {};
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}
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static type from_json(json const& j)
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{
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if (j.is_null())
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return {};
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return type{j.get<T>()};
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}
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};
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}
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TEST_CASE("constructors for user-defined types", "[udt]")
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{
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SECTION("empty type")
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{
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udt::empty_type const e;
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auto const j = json{e};
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auto k = json::object();
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CHECK(j == k);
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}
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SECTION("pod type")
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{
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auto const e = udt::pod_type{42, 42, 42};
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auto j = json{e};
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auto k = json{{"a", 42}, {"b", 42}, {"c", 42}};
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CHECK(j == k);
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}
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SECTION("bit more complex type")
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{
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auto const e =
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udt::bit_more_complex_type{{42, 42, 42}, {41, 41, 41}, "forty"};
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auto j = json{e};
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auto k = json{{"a", {{"a", 42}, {"b", 42}, {"c", 42}}},
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{"b", {{"a", 41}, {"b", 41}, {"c", 41}}},
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{"c", "forty"}};
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CHECK(j == k);
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}
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SECTION("vector of udt")
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{
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std::vector<udt::bit_more_complex_type> v;
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auto const e =
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udt::bit_more_complex_type{{42, 42, 42}, {41, 41, 41}, "forty"};
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v.emplace_back(e);
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v.emplace_back(e);
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v.emplace_back(e);
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json j = v;
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auto k = json{{"a", {{"a", 42}, {"b", 42}, {"c", 42}}},
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{"b", {{"a", 41}, {"b", 41}, {"c", 41}}},
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{"c", "forty"}};
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auto l = json{k, k, k};
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CHECK(j == l);
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}
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SECTION("optional type") {
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SECTION("regular case") {
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udt::optional_type<int> u{3};
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CHECK(json{u} == json(3));
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}
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SECTION("nullopt case") {
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udt::optional_type<float> v;
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CHECK(json{v} == json{});
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}
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SECTION("optional of json convertible type")
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{
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auto const e =
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udt::bit_more_complex_type{{42, 42, 42}, {41, 41, 41}, "forty"};
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udt::optional_type<udt::bit_more_complex_type> o{e};
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auto k = json{{"a", {{"a", 42}, {"b", 42}, {"c", 42}}},
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{"b", {{"a", 41}, {"b", 41}, {"c", 41}}},
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{"c", "forty"}};
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CHECK(json{o} == k);
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}
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SECTION("optional of vector of json convertible type")
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{
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std::vector<udt::bit_more_complex_type> v;
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auto const e =
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udt::bit_more_complex_type{{42, 42, 42}, {41, 41, 41}, "forty"};
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v.emplace_back(e);
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v.emplace_back(e);
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v.emplace_back(e);
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udt::optional_type<std::vector<udt::bit_more_complex_type>> o{v};
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auto k = json{{"a", {{"a", 42}, {"b", 42}, {"c", 42}}},
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{"b", {{"a", 41}, {"b", 41}, {"c", 41}}},
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{"c", "forty"}};
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auto l = json{k, k, k};
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CHECK(json{o} == l);
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}
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}
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}
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TEST_CASE("get<> for user-defined types", "[udt]")
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{
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SECTION("pod type")
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{
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auto const e = udt::pod_type{42, 42, 42};
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auto const j = json{{"a", 42}, {"b", 42}, {"c", 42}};
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auto const obj = j.get<udt::pod_type>();
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CHECK(e == obj);
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}
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SECTION("bit more complex type")
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{
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auto const e =
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udt::bit_more_complex_type{{42, 42, 42}, {41, 41, 41}, "forty"};
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auto const j = json{{"a", {{"a", 42}, {"b", 42}, {"c", 42}}},
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{"b", {{"a", 41}, {"b", 41}, {"c", 41}}},
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{"c", "forty"}};
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auto const obj = j.get<udt::bit_more_complex_type>();
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CHECK(e == obj);
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}
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SECTION("vector of udt")
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{
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auto const e =
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udt::bit_more_complex_type{{42, 42, 42}, {41, 41, 41}, "forty"};
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std::vector<udt::bit_more_complex_type> v{e, e, e};
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auto const j = json(v);
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auto const obj = j.get<decltype(v)>();
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CHECK(v == obj);
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}
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SECTION("optional")
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{
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SECTION("from null")
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{
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udt::optional_type<int> o;
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json j;
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CHECK(j.get<decltype(o)>() == o);
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}
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SECTION("from value")
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{
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json j{{"a", 42}, {"b", 42}, {"c", 42}};
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auto v = j.get<udt::optional_type<udt::pod_type>>();
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auto expected = udt::pod_type{42,42,42};
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REQUIRE(v);
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CHECK(*v == expected);
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}
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}
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}
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