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https://github.com/nlohmann/json.git
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Niels Lohmann
5d534dbd8e
The 11.8.0 leg's graceful C++17 fallback (added in the previous commit) worked correctly, but the broadened smoke test used the <=> operator unconditionally, which isn't valid syntax pre-C++20 — nvcc rejected it with "expected an expression" once the CMake logic picked cuda_std_17 for the older toolkit. Gate those two lines behind JSON_HAS_THREE_WAY_COMPARISON like the library itself does internally. Sanity-compiled the file as plain C++ at both -std=c++17 (skips the guarded block) and -std=c++20 (includes it) locally; the actual nvcc build is verified via CI on PR #5248. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
36 lines
1.1 KiB
Plaintext
36 lines
1.1 KiB
Plaintext
// __ _____ _____ _____
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// __| | __| | | | JSON for Modern C++ (supporting code)
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// | | |__ | | | | | | version 3.12.0
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// |_____|_____|_____|_|___| https://github.com/nlohmann/json
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//
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// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
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// SPDX-License-Identifier: MIT
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#include <nlohmann/json.hpp>
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int main()
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{
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nlohmann::ordered_json json = {"Test"};
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json.dump();
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// regression for #3013 (ordered_json::reset() compile error with nvcc)
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nlohmann::ordered_json metadata;
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metadata.erase("key");
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// exercise comparisons (operator==/operator<=>, gated by
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// JSON_HAS_THREE_WAY_COMPARISON, independent of JSON_HAS_RANGES) and
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// range-based iteration (exercises iteration_proxy/ranges machinery
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// beyond just the enable_borrowed_range specialization) — see #3907
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nlohmann::json a = {1, 2, 3};
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nlohmann::json b = {1, 2, 3};
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static_cast<void>(a == b);
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#if JSON_HAS_THREE_WAY_COMPARISON
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static_cast<void>(a <=> b); // *NOPAD*
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static_cast<void>(a <=> 1); // *NOPAD*
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#endif
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for (const auto& element : a)
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{
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static_cast<void>(element);
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}
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}
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