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63711510b6
... you are too slow and QJson API is so ugly. Now using this wonderful json lib: https://github.com/nlohmann/json Results in release mode (QJson tests are not shown but QJson was even slower than string concat). PASS : TestQgsJsonUtils::testExportAttributesJson(Use json) RESULT : TestQgsJsonUtils::testExportAttributesJson():"Use json": 0.0022 msecs per iteration (total: 75, iterations: 32768) PASS : TestQgsJsonUtils::testExportAttributesJson(Use old string concat) RESULT : TestQgsJsonUtils::testExportAttributesJson():"Use old string concat": 0.0032 msecs per iteration (total: 54, iterations: 16384) PASS : TestQgsJsonUtils::testExportFeatureJson(Use json) RESULT : TestQgsJsonUtils::testExportFeatureJson():"Use json": 0.011 msecs per iteration (total: 96, iterations: 8192) PASS : TestQgsJsonUtils::testExportFeatureJson(Use old string concat) RESULT : TestQgsJsonUtils::testExportFeatureJson():"Use old string concat": 0.015 msecs per iteration (total: 64, iterations: 4096) PASS : TestQgsJsonUtils::testExportGeomToJson(Use json) RESULT : TestQgsJsonUtils::testExportGeomToJson():"Use json": 0.76 msecs per iteration (total: 98, iterations: 128) PASS : TestQgsJsonUtils::testExportGeomToJson(Use old string concat) RESULT : TestQgsJsonUtils::testExportGeomToJson():"Use old string concat": 0.85 msecs per iteration (total: 55, iterations: 64) PASS : TestQgsJsonUtils::cleanupTestCase()
50 lines
1.5 KiB
C++
50 lines
1.5 KiB
C++
#pragma once
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#include <utility>
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#include <nlohmann/detail/conversions/from_json.hpp>
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#include <nlohmann/detail/conversions/to_json.hpp>
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namespace nlohmann
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{
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template<typename, typename>
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struct adl_serializer
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{
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/*!
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@brief convert a JSON value to any value type
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This function is usually called by the `get()` function of the
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@ref basic_json class (either explicit or via conversion operators).
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@param[in] j JSON value to read from
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@param[in,out] val value to write to
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*/
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template<typename BasicJsonType, typename ValueType>
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static auto from_json(BasicJsonType&& j, ValueType& val) noexcept(
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noexcept(::nlohmann::from_json(std::forward<BasicJsonType>(j), val)))
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-> decltype(::nlohmann::from_json(std::forward<BasicJsonType>(j), val), void())
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{
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::nlohmann::from_json(std::forward<BasicJsonType>(j), val);
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}
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/*!
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@brief convert any value type to a JSON value
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This function is usually called by the constructors of the @ref basic_json
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class.
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@param[in,out] j JSON value to write to
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@param[in] val value to read from
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*/
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template <typename BasicJsonType, typename ValueType>
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static auto to_json(BasicJsonType& j, ValueType&& val) noexcept(
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noexcept(::nlohmann::to_json(j, std::forward<ValueType>(val))))
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-> decltype(::nlohmann::to_json(j, std::forward<ValueType>(val)), void())
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{
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::nlohmann::to_json(j, std::forward<ValueType>(val));
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}
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};
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} // namespace nlohmann
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