mirror of
https://github.com/nlohmann/json.git
synced 2026-10-01 05:23:47 +07:00
Niels Lohmann
f295970fb6
Float tokens that Clinger's fast path cannot convert (e.g. the 17-digit coordinates of canada.json) went to strtod unless std::from_chars was available. It is not used in C++11/14, and not with libc++, which does not define __cpp_lib_to_chars. The Eisel-Lemire algorithm (after fast_float's compute_float) now converts them with integer arithmetic, correctly rounded for any token with at most 19 significant digits. Longer tokens are truncated; the result is used if w and w + 1 round alike, else strtod decides as before. Overflow still yields infinity (out_of_range.406). The table of powers of five (fast_float's) lives in pow5_table.hpp; a unit test recomputes every entry with big-integer arithmetic. Further tests: known values generated with Python (whose float() is correctly rounded), 200,000 round trips through to_chars, and the 128-bit multiplication and leading-zero count against big-integer references (both with and without a 128-bit type). Checked against strtod on 6.5 million tokens, among them 60,000 exact halfway cases: no difference. json::parse on canada.json: -8.6% (C++11), -7.6% (C++17, Apple clang); other files unchanged. Compile time of a TU including json.hpp: +0.7%. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
86 lines
3.4 KiB
Python
86 lines
3.4 KiB
Python
load("@rules_cc//cc:cc_library.bzl", "cc_library")
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load("@rules_license//rules:license.bzl", "license")
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package(
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default_applicable_licenses = [":license"],
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)
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exports_files([
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"LICENSE.MIT",
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])
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license(
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name = "license",
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license_kinds = ["@rules_license//licenses/spdx:MIT"],
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license_text = "LICENSE.MIT",
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)
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cc_library(
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name = "json",
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hdrs = [
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"include/nlohmann/adl_serializer.hpp",
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"include/nlohmann/byte_container_with_subtype.hpp",
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"include/nlohmann/detail/abi_macros.hpp",
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"include/nlohmann/detail/bit_ops.hpp",
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"include/nlohmann/detail/conversions/from_json.hpp",
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"include/nlohmann/detail/conversions/to_chars.hpp",
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"include/nlohmann/detail/conversions/to_json.hpp",
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"include/nlohmann/detail/exceptions.hpp",
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"include/nlohmann/detail/hash.hpp",
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"include/nlohmann/detail/input/binary_reader.hpp",
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"include/nlohmann/detail/input/input_adapters.hpp",
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"include/nlohmann/detail/input/json_sax.hpp",
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"include/nlohmann/detail/input/lexer.hpp",
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"include/nlohmann/detail/input/number_parse.hpp",
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"include/nlohmann/detail/input/parser.hpp",
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"include/nlohmann/detail/input/position_t.hpp",
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"include/nlohmann/detail/input/pow5_table.hpp",
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"include/nlohmann/detail/input/string_scan.hpp",
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"include/nlohmann/detail/iterators/internal_iterator.hpp",
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"include/nlohmann/detail/iterators/iter_impl.hpp",
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"include/nlohmann/detail/iterators/iteration_proxy.hpp",
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"include/nlohmann/detail/iterators/iterator_traits.hpp",
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"include/nlohmann/detail/iterators/json_reverse_iterator.hpp",
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"include/nlohmann/detail/iterators/primitive_iterator.hpp",
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"include/nlohmann/detail/json_custom_base_class.hpp",
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"include/nlohmann/detail/json_pointer.hpp",
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"include/nlohmann/detail/json_ref.hpp",
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"include/nlohmann/detail/macro_scope.hpp",
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"include/nlohmann/detail/macro_unscope.hpp",
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"include/nlohmann/detail/meta/call_std/begin.hpp",
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"include/nlohmann/detail/meta/call_std/end.hpp",
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"include/nlohmann/detail/meta/cpp_future.hpp",
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"include/nlohmann/detail/meta/detected.hpp",
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"include/nlohmann/detail/meta/identity_tag.hpp",
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"include/nlohmann/detail/meta/is_sax.hpp",
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"include/nlohmann/detail/meta/logic.hpp",
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"include/nlohmann/detail/meta/std_fs.hpp",
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"include/nlohmann/detail/meta/type_traits.hpp",
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"include/nlohmann/detail/meta/void_t.hpp",
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"include/nlohmann/detail/output/binary_writer.hpp",
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"include/nlohmann/detail/output/output_adapters.hpp",
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"include/nlohmann/detail/output/serializer.hpp",
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"include/nlohmann/detail/recursion_depth_limit.hpp",
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"include/nlohmann/detail/string_concat.hpp",
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"include/nlohmann/detail/string_escape.hpp",
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"include/nlohmann/detail/string_utils.hpp",
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"include/nlohmann/detail/value_t.hpp",
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"include/nlohmann/json.hpp",
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"include/nlohmann/json_fwd.hpp",
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"include/nlohmann/ordered_map.hpp",
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"include/nlohmann/thirdparty/hedley/hedley.hpp",
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"include/nlohmann/thirdparty/hedley/hedley_undef.hpp",
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],
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includes = ["include"],
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visibility = ["//visibility:public"],
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)
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cc_library(
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name = "singleheader-json",
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hdrs = [
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"single_include/nlohmann/json.hpp",
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],
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includes = ["single_include"],
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visibility = ["//visibility:public"],
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)
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