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Split unit-conversions.cpp so MinGW can link it

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clang 18 with the MinGW linker failed to link test-conversions_cpp17
("relocation truncated to fit: IMAGE_REL_AMD64_REL32"). As windows.yml
recommends, keep the objects small by splitting the test file.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann
2026-10-04 14:49:52 +02:00
parent fd0261d909
commit e8239afff1
2 changed files with 868 additions and 805 deletions
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tests/src/unit-conversions2.cpp
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// __ _____ _____ _____
// __| | __| | | | JSON for Modern C++ (supporting code)
// | | |__ | | | | | | version 3.12.0
// |_____|_____|_____|_|___| https://github.com/nlohmann/json
//
// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
// SPDX-License-Identifier: MIT
// cmake/test.cmake selects the C++ standard versions with which to build a
// unit test based on the presence of JSON_HAS_CPP_<VERSION> macros.
// When using macros that are only defined for particular versions of the standard
// (e.g., JSON_HAS_FILESYSTEM for C++17 and up), please mention the corresponding
// version macro in a comment close by, like this:
// JSON_HAS_CPP_<VERSION> (do not remove; see note at top of file)
#include "doctest_compatibility.h"
// skip tests if JSON_DisableEnumSerialization=ON (#4384)
#if defined(JSON_DISABLE_ENUM_SERIALIZATION) && (JSON_DISABLE_ENUM_SERIALIZATION == 1)
#define SKIP_TESTS_FOR_ENUM_SERIALIZATION
#endif
#define JSON_TESTS_PRIVATE
#include <nlohmann/json.hpp>
using nlohmann::json;
#include <deque>
#include <forward_list>
#include <list>
#include <set>
#include <unordered_map>
#include <unordered_set>
#include <valarray>
// NLOHMANN_JSON_SERIALIZE_ENUM uses a static std::pair
DOCTEST_CLANG_SUPPRESS_WARNING_PUSH
DOCTEST_CLANG_SUPPRESS_WARNING("-Wexit-time-destructors")
#if (defined(__cplusplus) && __cplusplus >= 201703L) || (defined(_HAS_CXX17) && _HAS_CXX17 == 1) // fix for issue #464
#define JSON_HAS_CPP_17
#define JSON_HAS_CPP_14
#elif (defined(__cplusplus) && __cplusplus >= 201402L) || (defined(_HAS_CXX14) && _HAS_CXX14 == 1)
#define JSON_HAS_CPP_14
#endif
#ifdef JSON_HAS_CPP_17
#if __has_include(<optional>)
#include <optional>
#elif __has_include(<experimental/optional>)
#include <experimental/optional>
#endif
#endif
#if defined(JSON_HAS_CPP_17)
#include <string_view>
#endif
TEST_CASE("value conversion")
{
SECTION("get a binary value (explicit)")
{
json::binary_t const n_reference{{1, 2, 3}};
json j(n_reference);
SECTION("binary_t")
{
json::binary_t const b = j.get<json::binary_t>();
CHECK(*json(b).m_data.m_value.binary == *j.m_data.m_value.binary);
}
SECTION("get_binary()")
{
SECTION("non-const")
{
auto& b = j.get_binary();
CHECK(*json(b).m_data.m_value.binary == *j.m_data.m_value.binary);
}
SECTION("non-const")
{
const json j_const = j; // NOLINT(performance-unnecessary-copy-initialization)
const auto& b = j_const.get_binary();
CHECK(*json(b).m_data.m_value.binary == *j.m_data.m_value.binary);
}
}
SECTION("exception in case of a non-string type")
{
json j_null(json::value_t::null);
json j_object(json::value_t::object);
json j_array(json::value_t::array);
json j_string(json::value_t::string);
json j_boolean(json::value_t::boolean);
const json j_null_const(json::value_t::null);
const json j_object_const(json::value_t::object);
const json j_array_const(json::value_t::array);
const json j_string_const(json::value_t::string);
const json j_boolean_const(json::value_t::boolean);
CHECK_THROWS_WITH_AS(j_null.get<json::binary_t>(),
"[json.exception.type_error.302] type must be binary, but is null",
json::type_error&);
CHECK_THROWS_WITH_AS(j_object.get<json::binary_t>(),
"[json.exception.type_error.302] type must be binary, but is object",
json::type_error&);
CHECK_THROWS_WITH_AS(j_array.get<json::binary_t>(),
"[json.exception.type_error.302] type must be binary, but is array",
json::type_error&);
CHECK_THROWS_WITH_AS(j_string.get<json::binary_t>(),
"[json.exception.type_error.302] type must be binary, but is string",
json::type_error&);
CHECK_THROWS_WITH_AS(j_boolean.get<json::binary_t>(),
"[json.exception.type_error.302] type must be binary, but is boolean",
json::type_error&);
CHECK_THROWS_WITH_AS(j_null_const.get<json::binary_t>(),
"[json.exception.type_error.302] type must be binary, but is null",
json::type_error&);
CHECK_THROWS_WITH_AS(j_object_const.get<json::binary_t>(),
"[json.exception.type_error.302] type must be binary, but is object",
json::type_error&);
CHECK_THROWS_WITH_AS(j_array_const.get<json::binary_t>(),
"[json.exception.type_error.302] type must be binary, but is array",
json::type_error&);
CHECK_THROWS_WITH_AS(j_string_const.get<json::binary_t>(),
"[json.exception.type_error.302] type must be binary, but is string",
json::type_error&);
CHECK_THROWS_WITH_AS(j_boolean_const.get<json::binary_t>(),
"[json.exception.type_error.302] type must be binary, but is boolean",
json::type_error&);
CHECK_THROWS_WITH_AS(j_null.get_binary(),
"[json.exception.type_error.302] type must be binary, but is null",
json::type_error&);
CHECK_THROWS_WITH_AS(j_object.get_binary(),
"[json.exception.type_error.302] type must be binary, but is object",
json::type_error&);
CHECK_THROWS_WITH_AS(j_array.get_binary(),
"[json.exception.type_error.302] type must be binary, but is array",
json::type_error&);
CHECK_THROWS_WITH_AS(j_string.get_binary(),
"[json.exception.type_error.302] type must be binary, but is string",
json::type_error&);
CHECK_THROWS_WITH_AS(j_boolean.get_binary(),
"[json.exception.type_error.302] type must be binary, but is boolean",
json::type_error&);
CHECK_THROWS_WITH_AS(j_null_const.get_binary(),
"[json.exception.type_error.302] type must be binary, but is null",
json::type_error&);
CHECK_THROWS_WITH_AS(j_object_const.get_binary(),
"[json.exception.type_error.302] type must be binary, but is object",
json::type_error&);
CHECK_THROWS_WITH_AS(j_array_const.get_binary(),
"[json.exception.type_error.302] type must be binary, but is array",
json::type_error&);
CHECK_THROWS_WITH_AS(j_string_const.get_binary(),
"[json.exception.type_error.302] type must be binary, but is string",
json::type_error&);
CHECK_THROWS_WITH_AS(j_boolean_const.get_binary(),
"[json.exception.type_error.302] type must be binary, but is boolean",
json::type_error&);
}
}
#if JSON_USE_IMPLICIT_CONVERSIONS
SECTION("get a binary value (implicit)")
{
json::binary_t const n_reference{{1, 2, 3}};
json const j(n_reference);
SECTION("binary_t")
{
json::binary_t const b = j;
CHECK(*json(b).m_data.m_value.binary == *j.m_data.m_value.binary);
}
}
#endif
#ifndef SKIP_TESTS_FOR_ENUM_SERIALIZATION
SECTION("get an enum")
{
enum c_enum { value_1, value_2 }; // NOLINT(cppcoreguidelines-use-enum-class)
enum class cpp_enum { value_1, value_2 };
CHECK(json(value_1).get<c_enum>() == value_1);
CHECK(json(cpp_enum::value_1).get<cpp_enum>() == cpp_enum::value_1);
}
SECTION("get an enum with underlying type bool (#5671)")
{
enum class bool_enum : bool { off, on };
CHECK(json(bool_enum::off).get<bool_enum>() == bool_enum::off);
CHECK(json(bool_enum::on).get<bool_enum>() == bool_enum::on);
}
#endif
SECTION("more involved conversions")
{
SECTION("object-like STL containers")
{
json const j1 = {{"one", 1}, {"two", 2}, {"three", 3}};
json const j2 = {{"one", 1u}, {"two", 2u}, {"three", 3u}};
json const j3 = {{"one", 1.1}, {"two", 2.2}, {"three", 3.3}};
json const j4 = {{"one", true}, {"two", false}, {"three", true}};
json const j5 = {{"one", "eins"}, {"two", "zwei"}, {"three", "drei"}};
SECTION("std::map")
{
CHECK(j1.get<std::map<std::string, int>>() == (std::map<std::string, int> {{"one", 1}, {"two", 2}, {"three", 3}}));
CHECK(j2.get<std::map<std::string, unsigned int>>() == (std::map<std::string, unsigned int> {{"one", 1u}, {"two", 2u}, {"three", 3u}}));
CHECK(j3.get<std::map<std::string, double>>() == (std::map<std::string, double> {{"one", 1.1}, {"two", 2.2}, {"three", 3.3}}));
CHECK(j4.get<std::map<std::string, bool>>() == (std::map<std::string, bool> {{"one", true}, {"two", false}, {"three", true}}));
CHECK(j5.get<std::map<std::string, std::string>>() == (std::map<std::string, std::string> {{"one", "eins"}, {"two", "zwei"}, {"three", "drei"}}));
}
SECTION("std::unordered_map")
{
CHECK(j1.get<std::unordered_map<std::string, int>>() == (std::unordered_map<std::string, int> {{"one", 1}, {"two", 2}, {"three", 3}}));
CHECK(j2.get<std::unordered_map<std::string, unsigned int>>() == (std::unordered_map<std::string, unsigned int> {{"one", 1u}, {"two", 2u}, {"three", 3u}}));
CHECK(j3.get<std::unordered_map<std::string, double>>() == (std::unordered_map<std::string, double> {{"one", 1.1}, {"two", 2.2}, {"three", 3.3}}));
CHECK(j4.get<std::unordered_map<std::string, bool>>() == (std::unordered_map<std::string, bool> {{"one", true}, {"two", false}, {"three", true}}));
const auto m5 = j5.get<std::unordered_map<std::string, std::string>>();
CHECK(m5 == (std::unordered_map<std::string, std::string> {{"one", "eins"}, {"two", "zwei"}, {"three", "drei"}}));
CHECK(m5.at("one") == "eins");
}
SECTION("reserve is called on containers that support it (#5406)")
{
// build a larger object so that a missing/incorrect reserve()
// call would be more likely to corrupt or drop elements
json j_large;
for (int i = 0; i < 100; ++i)
{
j_large[std::to_string(i)] = i;
}
SECTION("std::unordered_map (supports reserve)")
{
const auto m = j_large.get<std::unordered_map<std::string, int>>();
CHECK(m.size() == 100);
for (int i = 0; i < 100; ++i)
{
CHECK(m.at(std::to_string(i)) == i);
}
}
SECTION("std::map (no reserve, fallback path)")
{
const auto m = j_large.get<std::map<std::string, int>>();
CHECK(m.size() == 100);
for (int i = 0; i < 100; ++i)
{
CHECK(m.at(std::to_string(i)) == i);
}
}
}
SECTION("std::multimap")
{
CHECK(j1.get<std::multimap<std::string, int>>() == (std::multimap<std::string, int> {{"one", 1}, {"two", 2}, {"three", 3}}));
CHECK(j2.get<std::multimap<std::string, unsigned int>>() == (std::multimap<std::string, unsigned int> {{"one", 1u}, {"two", 2u}, {"three", 3u}}));
CHECK(j3.get<std::multimap<std::string, double>>() == (std::multimap<std::string, double> {{"one", 1.1}, {"two", 2.2}, {"three", 3.3}}));
CHECK(j4.get<std::multimap<std::string, bool>>() == (std::multimap<std::string, bool> {{"one", true}, {"two", false}, {"three", true}}));
const auto m5 = j5.get<std::multimap<std::string, std::string>>();
CHECK(m5 == (std::multimap<std::string, std::string> {{"one", "eins"}, {"two", "zwei"}, {"three", "drei"}}));
CHECK(m5.find("one")->second == "eins");
}
SECTION("std::unordered_multimap")
{
CHECK(j1.get<std::unordered_multimap<std::string, int>>() == (std::unordered_multimap<std::string, int> {{"one", 1}, {"two", 2}, {"three", 3}}));
CHECK(j2.get<std::unordered_multimap<std::string, unsigned int>>() == (std::unordered_multimap<std::string, unsigned int> {{"one", 1u}, {"two", 2u}, {"three", 3u}}));
CHECK(j3.get<std::unordered_multimap<std::string, double>>() == (std::unordered_multimap<std::string, double> {{"one", 1.1}, {"two", 2.2}, {"three", 3.3}}));
CHECK(j4.get<std::unordered_multimap<std::string, bool>>() == (std::unordered_multimap<std::string, bool> {{"one", true}, {"two", false}, {"three", true}}));
const auto m5 = j5.get<std::unordered_multimap<std::string, std::string>>();
CHECK(m5 == (std::unordered_multimap<std::string, std::string> {{"one", "eins"}, {"two", "zwei"}, {"three", "drei"}}));
CHECK(m5.find("one")->second == "eins");
}
SECTION("exception in case of a non-object type")
{
CHECK_THROWS_WITH_AS(
(json().get<std::map<std::string, int>>()),
"[json.exception.type_error.302] type must be object, but is null", json::type_error&);
}
}
SECTION("array-like STL containers")
{
json const j1 = {1, 2, 3, 4};
json const j2 = {1u, 2u, 3u, 4u};
json const j3 = {1.2, 2.3, 3.4, 4.5};
json const j4 = {true, false, true};
json const j5 = {"one", "two", "three"};
SECTION("std::list")
{
CHECK(j1.get<std::list<int>>() == (std::list<int> {1, 2, 3, 4}));
CHECK(j2.get<std::list<unsigned int>>() == (std::list<unsigned int> {1u, 2u, 3u, 4u}));
CHECK(j3.get<std::list<double>>() == (std::list<double> {1.2, 2.3, 3.4, 4.5}));
CHECK(j4.get<std::list<bool>>() == (std::list<bool> {true, false, true}));
CHECK(j5.get<std::list<std::string>>() == (std::list<std::string> {"one", "two", "three"}));
}
SECTION("std::forward_list")
{
CHECK(j1.get<std::forward_list<int>>() == (std::forward_list<int> {1, 2, 3, 4}));
CHECK(j2.get<std::forward_list<unsigned int>>() == (std::forward_list<unsigned int> {1u, 2u, 3u, 4u}));
CHECK(j3.get<std::forward_list<double>>() == (std::forward_list<double> {1.2, 2.3, 3.4, 4.5}));
CHECK(j4.get<std::forward_list<bool>>() == (std::forward_list<bool> {true, false, true}));
CHECK(j5.get<std::forward_list<std::string>>() == (std::forward_list<std::string> {"one", "two", "three"}));
}
SECTION("std::array")
{
CHECK(j1.get<std::array<int, 4>>() == (std::array<int, 4> {{1, 2, 3, 4}}));
// only the first 3 elements of j2 are converted, since the target array is smaller
CHECK(j2.get<std::array<unsigned int, 3>>() == (std::array<unsigned int, 3> {{1u, 2u, 3u}}));
CHECK(j3.get<std::array<double, 4>>() == (std::array<double, 4> {{1.2, 2.3, 3.4, 4.5}}));
CHECK(j4.get<std::array<bool, 3>>() == (std::array<bool, 3> {{true, false, true}}));
CHECK(j5.get<std::array<std::string, 3>>() == (std::array<std::string, 3> {{"one", "two", "three"}}));
SECTION("std::array is larger than JSON")
{
std::array<int, 6> arr6 = {{1, 2, 3, 4, 5, 6}};
CHECK_THROWS_WITH_AS(j1.get_to(arr6), "[json.exception.out_of_range.401] "
"array index 4 is out of range", json::out_of_range&);
}
SECTION("std::array is smaller than JSON")
{
std::array<int, 2> arr2 = {{8, 9}};
j1.get_to(arr2);
CHECK(arr2[0] == 1);
CHECK(arr2[1] == 2);
}
}
SECTION("std::valarray")
{
// valarray has no operator== that returns bool, so compare via a vector copy
const auto v1 = j1.get<std::valarray<int>>();
CHECK((std::vector<int>(std::begin(v1), std::end(v1)) == std::vector<int> {1, 2, 3, 4}));
const auto v2 = j2.get<std::valarray<unsigned int>>();
CHECK((std::vector<unsigned int>(std::begin(v2), std::end(v2)) == std::vector<unsigned int> {1u, 2u, 3u, 4u}));
const auto v3 = j3.get<std::valarray<double>>();
CHECK((std::vector<double>(std::begin(v3), std::end(v3)) == std::vector<double> {1.2, 2.3, 3.4, 4.5}));
const auto v4 = j4.get<std::valarray<bool>>();
CHECK((std::vector<bool>(std::begin(v4), std::end(v4)) == std::vector<bool> {true, false, true}));
const auto v5 = j5.get<std::valarray<std::string>>();
CHECK((std::vector<std::string>(std::begin(v5), std::end(v5)) == std::vector<std::string> {"one", "two", "three"}));
}
SECTION("std::vector")
{
CHECK(j1.get<std::vector<int>>() == (std::vector<int> {1, 2, 3, 4}));
CHECK(j2.get<std::vector<unsigned int>>() == (std::vector<unsigned int> {1u, 2u, 3u, 4u}));
CHECK(j3.get<std::vector<double>>() == (std::vector<double> {1.2, 2.3, 3.4, 4.5}));
CHECK(j4.get<std::vector<bool>>() == (std::vector<bool> {true, false, true}));
CHECK(j5.get<std::vector<std::string>>() == (std::vector<std::string> {"one", "two", "three"}));
}
SECTION("std::deque")
{
CHECK(j1.get<std::deque<int>>() == (std::deque<int> {1, 2, 3, 4}));
CHECK(j2.get<std::deque<unsigned int>>() == (std::deque<unsigned int> {1u, 2u, 3u, 4u}));
CHECK(j3.get<std::deque<double>>() == (std::deque<double> {1.2, 2.3, 3.4, 4.5}));
CHECK(j4.get<std::deque<bool>>() == (std::deque<bool> {true, false, true}));
CHECK(j5.get<std::deque<std::string>>() == (std::deque<std::string> {"one", "two", "three"}));
}
SECTION("std::set")
{
CHECK(j1.get<std::set<int>>() == (std::set<int> {1, 2, 3, 4}));
CHECK(j2.get<std::set<unsigned int>>() == (std::set<unsigned int> {1u, 2u, 3u, 4u}));
CHECK(j3.get<std::set<double>>() == (std::set<double> {1.2, 2.3, 3.4, 4.5}));
CHECK(j4.get<std::set<bool>>() == (std::set<bool> {true, false, true}));
CHECK(j5.get<std::set<std::string>>() == (std::set<std::string> {"one", "two", "three"}));
}
SECTION("std::unordered_set")
{
CHECK(j1.get<std::unordered_set<int>>() == (std::unordered_set<int> {1, 2, 3, 4}));
CHECK(j2.get<std::unordered_set<unsigned int>>() == (std::unordered_set<unsigned int> {1u, 2u, 3u, 4u}));
CHECK(j3.get<std::unordered_set<double>>() == (std::unordered_set<double> {1.2, 2.3, 3.4, 4.5}));
CHECK(j4.get<std::unordered_set<bool>>() == (std::unordered_set<bool> {true, false, true}));
CHECK(j5.get<std::unordered_set<std::string>>() == (std::unordered_set<std::string> {"one", "two", "three"}));
}
SECTION("std::map (array of pairs)")
{
const std::map<int, int> m{{0, 1}, {1, 2}, {2, 3}};
json const j6 = m;
auto m2 = j6.get<std::map<int, int>>();
CHECK(m == m2);
json const j7 = {0, 1, 2, 3};
json const j8 = 2;
#if JSON_DIAGNOSTICS
CHECK_THROWS_WITH_AS((j7.get<std::map<int, int>>()),
"[json.exception.type_error.302] (/0) type must be array, "
"but is number", json::type_error&);
#else
CHECK_THROWS_WITH_AS((j7.get<std::map<int, int>>()),
"[json.exception.type_error.302] type must be array, "
"but is number", json::type_error&);
#endif
CHECK_THROWS_WITH_AS((j8.get<std::map<int, int>>()),
"[json.exception.type_error.302] type must be array, "
"but is number", json::type_error&);
SECTION("superfluous entries")
{
json const j9 = {{0, 1, 2}, {1, 2, 3}, {2, 3, 4}};
m2 = j9.get<std::map<int, int>>();
CHECK(m == m2);
}
}
SECTION("std::unordered_map (array of pairs)")
{
const std::unordered_map<int, int> m{{0, 1}, {1, 2}, {2, 3}};
json const j6 = m;
auto m2 = j6.get<std::unordered_map<int, int>>();
CHECK(m == m2);
json const j7 = {0, 1, 2, 3};
json const j8 = 2;
#if JSON_DIAGNOSTICS
CHECK_THROWS_WITH_AS((j7.get<std::unordered_map<int, int>>()),
"[json.exception.type_error.302] (/0) type must be array, "
"but is number", json::type_error&);
#else
CHECK_THROWS_WITH_AS((j7.get<std::unordered_map<int, int>>()),
"[json.exception.type_error.302] type must be array, "
"but is number", json::type_error&);
#endif
CHECK_THROWS_WITH_AS((j8.get<std::unordered_map<int, int>>()),
"[json.exception.type_error.302] type must be array, "
"but is number", json::type_error&);
SECTION("superfluous entries")
{
json const j9{{0, 1, 2}, {1, 2, 3}, {2, 3, 4}};
m2 = j9.get<std::unordered_map<int, int>>();
CHECK(m == m2);
}
}
SECTION("exception in case of a non-object type")
{
// does type really must be an array? or it rather must not be null?
// that's what I thought when other test like this one broke
CHECK_THROWS_WITH_AS(
(json().get<std::list<int>>()),
"[json.exception.type_error.302] type must be array, but is null", json::type_error&);
CHECK_THROWS_WITH_AS(
(json().get<std::vector<int>>()),
"[json.exception.type_error.302] type must be array, but is null", json::type_error&);
CHECK_THROWS_WITH_AS(
(json().get<std::vector<json>>()),
"[json.exception.type_error.302] type must be array, but is null", json::type_error&);
CHECK_THROWS_WITH_AS(
(json().get<std::list<json>>()),
"[json.exception.type_error.302] type must be array, but is null", json::type_error&);
CHECK_THROWS_WITH_AS(
(json().get<std::valarray<int>>()),
"[json.exception.type_error.302] type must be array, but is null", json::type_error&);
CHECK_THROWS_WITH_AS(
(json().get<std::map<int, int>>()),
"[json.exception.type_error.302] type must be array, but is null", json::type_error&);
}
}
}
}
enum class cards {kreuz, pik, herz, karo};
// NOLINTNEXTLINE(misc-use-internal-linkage,misc-const-correctness) - false positive
NLOHMANN_JSON_SERIALIZE_ENUM(cards,
{
{cards::kreuz, "kreuz"},
{cards::pik, "pik"},
{cards::pik, "puk"}, // second entry for cards::puk; will not be used
{cards::herz, "herz"},
{cards::karo, "karo"}
})
enum TaskState // NOLINT(cert-int09-c,readability-enum-initial-value,cppcoreguidelines-use-enum-class)
{
TS_STOPPED,
TS_RUNNING,
TS_COMPLETED,
TS_INVALID = -1,
};
// NOLINTNEXTLINE(misc-const-correctness,misc-use-internal-linkage) - false positive
NLOHMANN_JSON_SERIALIZE_ENUM(TaskState,
{
{TS_INVALID, nullptr},
{TS_STOPPED, "stopped"},
{TS_RUNNING, "running"},
{TS_COMPLETED, "completed"},
})
TEST_CASE("JSON to enum mapping")
{
SECTION("enum class")
{
// enum -> json
CHECK(json(cards::kreuz) == "kreuz");
CHECK(json(cards::pik) == "pik");
CHECK(json(cards::herz) == "herz");
CHECK(json(cards::karo) == "karo");
// json -> enum
CHECK(cards::kreuz == json("kreuz"));
CHECK(cards::pik == json("pik"));
CHECK(cards::herz == json("herz"));
CHECK(cards::karo == json("karo"));
// invalid json -> first enum
CHECK(cards::kreuz == json("what?").get<cards>());
}
SECTION("traditional enum")
{
// enum -> json
CHECK(json(TS_STOPPED) == "stopped");
CHECK(json(TS_RUNNING) == "running");
CHECK(json(TS_COMPLETED) == "completed");
CHECK(json(TS_INVALID) == json());
// json -> enum
CHECK(TS_STOPPED == json("stopped"));
CHECK(TS_RUNNING == json("running"));
CHECK(TS_COMPLETED == json("completed"));
CHECK(TS_INVALID == json());
// invalid json -> first enum
CHECK(TS_INVALID == json("what?").get<TaskState>());
}
}
enum class strict_cards {kreuz, pik, herz, karo, andere}; // andere not included in mapping
// NOLINTNEXTLINE(misc-use-internal-linkage,misc-const-correctness) - false positive
NLOHMANN_JSON_SERIALIZE_ENUM_STRICT(strict_cards,
{
{strict_cards::kreuz, "kreuz"},
{strict_cards::pik, "pik"},
{strict_cards::pik, "puk"}, // second entry for cards::pik; will not be used
{strict_cards::herz, "herz"},
{strict_cards::karo, "karo"}
})
enum StrictTaskState // NOLINT(cert-int09-c,readability-enum-initial-value,cppcoreguidelines-use-enum-class)
{
STRICT_TS_STOPPED,
STRICT_TS_RUNNING,
STRICT_TS_COMPLETED,
STRICT_TS_OTHER, // STRICT_TS_OTHER not in mapping
STRICT_TS_INVALID = -1,
};
// NOLINTNEXTLINE(misc-const-correctness,misc-use-internal-linkage) - false positive
NLOHMANN_JSON_SERIALIZE_ENUM_STRICT(StrictTaskState,
{
{STRICT_TS_INVALID, nullptr},
{STRICT_TS_STOPPED, "stopped"},
{STRICT_TS_RUNNING, "running"},
{STRICT_TS_COMPLETED, "completed"},
})
// regression test for #5708 item 2: NLOHMANN_JSON_SERIALIZE_ENUM_STRICT must not rely on
// unqualified lookup of a helper name that a user's own namespace may also declare
namespace ns_with_colliding_name
{
// NOLINTNEXTLINE(misc-use-internal-linkage) - used to shadow the library's internal helper name
inline void templated_json_throw(int /*unused*/) {}
enum class colliding_enum { a, b };
// NOLINTNEXTLINE(misc-use-internal-linkage,misc-const-correctness,cppcoreguidelines-avoid-c-arrays,hicpp-avoid-c-arrays,modernize-avoid-c-arrays) - false positive
NLOHMANN_JSON_SERIALIZE_ENUM_STRICT(colliding_enum,
{
{colliding_enum::a, "a"},
{colliding_enum::b, "b"}
})
} // namespace ns_with_colliding_name
TEST_CASE("NLOHMANN_JSON_SERIALIZE_ENUM_STRICT in a namespace with a colliding name")
{
using ns_with_colliding_name::colliding_enum;
CHECK(json(colliding_enum::a) == "a");
CHECK(colliding_enum::b == json("b"));
json _;
CHECK_THROWS_WITH_AS(_ = json("nope").get<colliding_enum>(), "[json.exception.out_of_range.410] enum value out of range for colliding_enum: \"nope\"", json::out_of_range&);
}
TEST_CASE("Strict JSON to enum mapping")
{
SECTION("enum class")
{
// enum -> json
CHECK(json(strict_cards::kreuz) == "kreuz");
CHECK(json(strict_cards::pik) == "pik");
CHECK(json(strict_cards::herz) == "herz");
CHECK(json(strict_cards::karo) == "karo");
// json -> enum
CHECK(json("kreuz").get<strict_cards>() == strict_cards::kreuz);
CHECK(json("pik").get<strict_cards>() == strict_cards::pik);
CHECK(json("herz").get<strict_cards>() == strict_cards::herz);
CHECK(json("karo").get<strict_cards>() == strict_cards::karo);
// comparison of enum and json
CHECK(strict_cards::kreuz == json("kreuz"));
CHECK(strict_cards::pik == json("pik"));
CHECK(strict_cards::herz == json("herz"));
CHECK(strict_cards::karo == json("karo"));
// invalid json -> exception thrown
json _;
CHECK_THROWS_WITH_AS(_ = json("what?").get<strict_cards>(), "[json.exception.out_of_range.410] enum value out of range for strict_cards: \"what?\"", json::out_of_range&);
// conversion of unmapped enum -> exception thrown
CHECK_THROWS_WITH_AS(json(strict_cards::andere), "[json.exception.out_of_range.410] enum value out of range for strict_cards", json::out_of_range&);
// comparing an unmapped enum with json throws the same exception
// (the scalar comparison operators used to be noexcept, so this
// called std::terminate)
CHECK_THROWS_WITH_AS(static_cast<void>(strict_cards::andere == json("andere")), "[json.exception.out_of_range.410] enum value out of range for strict_cards", json::out_of_range&);
CHECK_THROWS_WITH_AS(static_cast<void>(json("andere") != strict_cards::andere), "[json.exception.out_of_range.410] enum value out of range for strict_cards", json::out_of_range&);
// invalid UTF-8 -> out_of_range.410, not the type_error.316 thrown while building the
// message (regression test for #5667); such strings can reach get<Enum>() unvalidated,
// e.g. from from_cbor()/from_msgpack() (#5529)
const json j_invalid_utf8 = "\xFF";
CHECK_THROWS_WITH_AS(_ = j_invalid_utf8.get<strict_cards>(), "[json.exception.out_of_range.410] enum value out of range for strict_cards: \"\xEF\xBF\xBD\"", json::out_of_range&);
}
SECTION("traditional enum")
{
// enum -> json
CHECK(json(STRICT_TS_STOPPED) == "stopped");
CHECK(json(STRICT_TS_RUNNING) == "running");
CHECK(json(STRICT_TS_COMPLETED) == "completed");
CHECK(json(STRICT_TS_INVALID) == json());
// json -> enum
CHECK(json("stopped").get<StrictTaskState>() == STRICT_TS_STOPPED);
CHECK(json("running").get<StrictTaskState>() == STRICT_TS_RUNNING);
CHECK(json("completed").get<StrictTaskState>() == STRICT_TS_COMPLETED);
CHECK(json().get<StrictTaskState>() == STRICT_TS_INVALID);
// comparison of enum and json
CHECK(STRICT_TS_STOPPED == json("stopped"));
CHECK(STRICT_TS_RUNNING == json("running"));
CHECK(STRICT_TS_COMPLETED == json("completed"));
CHECK(STRICT_TS_INVALID == json());
// invalid json -> exception thrown
json _;
CHECK_THROWS_WITH_AS(_ = json("what?").get<StrictTaskState>(), "[json.exception.out_of_range.410] enum value out of range for StrictTaskState: \"what?\"", json::out_of_range&);
// conversion of unmapped enum -> exception thrown
CHECK_THROWS_WITH_AS(json(STRICT_TS_OTHER), "[json.exception.out_of_range.410] enum value out of range for StrictTaskState", json::out_of_range&);
// comparing an unmapped enum with json throws the same exception
CHECK_THROWS_WITH_AS(static_cast<void>(STRICT_TS_OTHER < json("x")), "[json.exception.out_of_range.410] enum value out of range for StrictTaskState", json::out_of_range&);
}
}
#ifdef JSON_HAS_CPP_17
#if JSON_HAS_FILESYSTEM || JSON_HAS_EXPERIMENTAL_FILESYSTEM
TEST_CASE("std::filesystem::path")
{
SECTION("ascii")
{
json const j_string = "Path";
auto p = j_string.template get<nlohmann::detail::std_fs::path>();
json const j_path = p;
CHECK(j_path.template get<std::string>() ==
j_string.template get<std::string>());
}
SECTION("utf-8")
{
json const j_string = "P\xc4\x9b\xc5\xa1ina";
auto p = j_string.template get<nlohmann::detail::std_fs::path>();
json const j_path = p;
CHECK(j_path.template get<std::string>() ==
j_string.template get<std::string>());
}
}
#endif
// the ADL to_json overload for std::u8string only exists under the same guard
// as std::filesystem::path support (it is otherwise only reached indirectly,
// via std::filesystem::path::u8string()) -- mirror both #if conditions from
// include/nlohmann/detail/conversions/to_json.hpp exactly
#if JSON_HAS_FILESYSTEM || JSON_HAS_EXPERIMENTAL_FILESYSTEM
#if defined(__cpp_lib_char8_t)
TEST_CASE("std::u8string")
{
SECTION("ascii")
{
const std::u8string s = u8"Path";
json const j = s;
CHECK(j.template get<std::string>() == "Path");
}
SECTION("utf-8")
{
// use \u universal-character-names (rather than raw \x byte escapes
// or literal non-ASCII source bytes) to compose the multi-byte UTF-8
// encoding -- MSVC treats \x escapes used that way inside a u8
// literal as a nonstandard extension (warning C5321), which some of
// our CI configs promote to an error; \u is portable and produces
// the exact same encoded bytes without depending on the source
// file's encoding
const std::u8string s = u8"P\u011B\u0161ina";
json const j = s;
CHECK(j.template get<std::string>() == "P\xc4\x9b\xc5\xa1ina");
}
}
#endif
#endif
#if !defined(JSON_NOEXCEPTION)
namespace
{
// a type whose to_json reports an error by throwing, used below to check that
// converting a std::optional<T> to JSON propagates an exception thrown while
// converting its contained value instead of calling std::terminate (#5642)
struct throwing_to_json_type {};
[[noreturn]] void to_json(json& /*unused*/, const throwing_to_json_type& /*unused*/)
{
throw std::runtime_error("cannot serialize throwing_to_json_type");
}
} // namespace
#endif
TEST_CASE("std::optional")
{
SECTION("null")
{
const json j_null;
const std::optional<std::string> opt_null;
CHECK(json(opt_null) == j_null);
CHECK(j_null.get<std::optional<std::string>>() == std::nullopt);
// Constructing std::optional<T> directly from JSON null throws because
// std::optional's own converting constructor is chosen over basic_json's
// operator T(). This is a language-level limitation (std::optional<T> is
// constructible from T, and T is constructible from basic_json via the
// operator); there is no SFINAE path that distinguishes "call from inside
// std::optional's constructor" from "direct call". Use get<std::optional<T>>()
// or get_to() instead for correct null handling. See #4864 and #5246.
CHECK_THROWS_WITH_AS(std::optional<std::string>(j_null),
"[json.exception.type_error.302] type must be string, but is null", json::type_error&);
CHECK_THROWS_WITH_AS(std::optional<int>(j_null),
"[json.exception.type_error.302] type must be number, but is null", json::type_error&);
// Assignment goes through the same overload resolution as direct
// construction, so it throws for the same reason. This relies on
// basic_json's implicit conversion operator, so it only applies
// when JSON_USE_IMPLICIT_CONVERSIONS is enabled (the default).
#if JSON_USE_IMPLICIT_CONVERSIONS
std::optional<std::string> opt_assign;
CHECK_THROWS_WITH_AS(opt_assign = j_null,
"[json.exception.type_error.302] type must be string, but is null", json::type_error&);
#endif
// get_to() is the correct way to obtain std::nullopt from a JSON null.
std::optional<std::string> opt_get_to = "placeholder";
j_null.get_to(opt_get_to);
CHECK(opt_get_to == std::nullopt);
}
SECTION("string")
{
json j_string = "string";
std::optional<std::string> opt_string = "string";
CHECK(json(opt_string) == j_string);
CHECK(std::optional<std::string>(j_string) == opt_string);
// false positive: Infer attributes the destruction of the temporaries above to opt_string
// @infer-ignore USE_AFTER_DELETE
}
SECTION("bool")
{
json j_bool = true;
std::optional<bool> opt_bool = true;
CHECK(json(opt_bool) == j_bool);
CHECK(std::optional<bool>(j_bool) == opt_bool);
}
SECTION("number")
{
json j_number = 1;
std::optional<int> opt_int = 1;
CHECK(json(opt_int) == j_number);
CHECK(j_number.get<std::optional<int>>() == opt_int);
}
SECTION("array")
{
json j_array = {1, 2, nullptr};
std::vector<std::optional<int>> opt_array = {{1, 2, std::nullopt}};
CHECK(json(opt_array) == j_array);
CHECK(j_array.get<std::vector<std::optional<int>>>() == opt_array);
}
SECTION("object")
{
json j_object = {{"one", 1}, {"two", 2}, {"zero", nullptr}};
std::map<std::string, std::optional<int>> opt_object {{"one", 1}, {"two", 2}, {"zero", std::nullopt}};
CHECK(json(opt_object) == j_object);
CHECK(std::map<std::string, std::optional<int>>(j_object) == opt_object);
}
#if !defined(JSON_NOEXCEPTION)
SECTION("exception from contained value's to_json propagates (#5642)")
{
// to_json(BasicJsonType&, const std::optional<T>&) must not be
// noexcept: it calls T's to_json, which may throw (a user-defined
// to_json that reports an error, or std::bad_alloc for T =
// std::string/vector/json). Before the fix, this called
// std::terminate() instead of letting the exception propagate.
const std::optional<throwing_to_json_type> opt = throwing_to_json_type{};
CHECK_THROWS_WITH_AS(json(opt), "cannot serialize throwing_to_json_type", std::runtime_error&);
// the conversion is noexcept exactly when converting the contained value is
static_assert(!std::is_nothrow_constructible<json, const std::optional<throwing_to_json_type>&>::value);
static_assert(std::is_nothrow_constructible<json, const std::optional<int>&>::value);
}
#endif
}
#endif
#ifdef JSON_HAS_CPP_17
#undef JSON_HAS_CPP_17
#endif
#ifdef JSON_HAS_CPP_14
#undef JSON_HAS_CPP_14
#endif
DOCTEST_CLANG_SUPPRESS_WARNING_POP