test/src/unit-alt-number.cpp

/*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
|  |  |__   |  |  | | | |  version 3.8.0
|_____|_____|_____|_|___|  https://github.com/nlohmann/json

Licensed under the MIT License <http://opensource.org/licenses/MIT>.
SPDX-License-Identifier: MIT
Copyright (c) 2018 Vitaliy Manushkin <agri@akamo.info>.

Permission is hereby  granted, free of charge, to any  person obtaining a copy
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THE SOFTWARE  IS PROVIDED "AS  IS", WITHOUT WARRANTY  OF ANY KIND,  EXPRESS OR
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*/

#include "doctest_compatibility.h"

#include <nlohmann/json.hpp>

TEST_CASE("Alternative number types")
{
    SECTION("8 bit integers")
    {
        using json8 = nlohmann::basic_json<std::map, std::vector, std::string, bool, std::int8_t, std::uint8_t>;

        SECTION("unsigned")
        {
            std::uint8_t unsigned_max = 255;
            json8 j_unsigned_max = json8::parse("255");
            CHECK(j_unsigned_max.is_number_unsigned());
            CHECK(j_unsigned_max.dump() == "255");
            CHECK((j_unsigned_max.get<std::uint8_t>() == unsigned_max));
            CHECK(json8::parse(j_unsigned_max.dump()) == j_unsigned_max);

            json8 j_overflow = json8::parse("256");
            CHECK(j_overflow.is_number_float());
            CHECK(j_overflow.dump() == "256.0");
        }

        SECTION("signed")
        {
            std::int8_t signed_min = -128;
            json8 j_signed_min = json8::parse("-128");
            CHECK(j_signed_min.is_number_integer());
            CHECK(j_signed_min.dump() == "-128");
            CHECK((j_signed_min.get<std::int8_t>() == signed_min));
            CHECK(json8::parse(j_signed_min.dump()) == j_signed_min);

            json8 j_underflow = json8::parse("-129");
            CHECK(j_underflow.is_number_float());
            CHECK(j_underflow.dump() == "-129.0");
        }
    }

    SECTION("16 bit integers")
    {
        using json16 = nlohmann::basic_json<std::map, std::vector, std::string, bool, std::int16_t, std::uint16_t>;

        SECTION("unsigned")
        {
            std::uint16_t unsigned_max = 65535;
            json16 j_unsigned_max = json16::parse("65535");
            CHECK(j_unsigned_max.is_number_unsigned());
            CHECK(j_unsigned_max.dump() == "65535");
            CHECK((j_unsigned_max.get<std::uint16_t>() == unsigned_max));
            CHECK(json16::parse(j_unsigned_max.dump()) == j_unsigned_max);

            json16 j_overflow = json16::parse("65536");
            CHECK(j_overflow.is_number_float());
            CHECK(j_overflow.dump() == "65536.0");
        }

        SECTION("signed")
        {
            std::int16_t signed_min = -32768;
            json16 j_signed_min = json16::parse("-32768");
            CHECK(j_signed_min.is_number_integer());
            CHECK(j_signed_min.dump() == "-32768");
            CHECK((j_signed_min.get<std::int16_t>() == signed_min));
            CHECK(json16::parse(j_signed_min.dump()) == j_signed_min);

            json16 j_underflow = json16::parse("-32769");
            CHECK(j_underflow.is_number_float());
            CHECK(j_underflow.dump() == "-32769.0");
        }
    }

    // 128-bit arithmetic does not work with sanitizers
#if defined(__SIZEOF_INT128__) && !defined(__SANITIZE_ADDRESS__)
    SECTION("128 bit integers")
    {
        using json128 = nlohmann::basic_json<std::map, std::vector, std::string, bool, __int128_t, __uint128_t>;

        SECTION("unsigned")
        {
            __uint128_t unsigned_max = (340282366920938463463.374607431768211455) * std::pow(10, 18);
            json128 j_unsigned_max = json128::parse("340282366920938463463374607431768211455");
            CHECK(j_unsigned_max.is_number_unsigned());
            CHECK(j_unsigned_max.dump() == "340282366920938463463374607431768211455");
            //CHECK((j_unsigned_max.get<__uint128_t>() == unsigned_max));
            CHECK(json128::parse(j_unsigned_max.dump()) == j_unsigned_max);
        }

        SECTION("signed")
        {
            __int128_t signed_min = (-170141183460469231731.687303715884105728) * std::pow(10, 18);
            json128 j_signed_min = json128::parse("-170141183460469231731687303715884105728");
            CHECK(j_signed_min.is_number_integer());
            CHECK(j_signed_min.dump() == "-170141183460469231731687303715884105728");
            CHECK((j_signed_min.get<__int128_t>() == signed_min));
            CHECK(json128::parse(j_signed_min.dump()) == j_signed_min);
        }
    }
#endif
}