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49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
#pragma once
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#ifdef __clang__
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wdouble-promotion"
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#endif
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#include <double-conversion/double-conversion.h>
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#include <boost/noncopyable.hpp>
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#ifdef __clang__
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#pragma clang diagnostic pop
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#endif
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namespace DB
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{
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template <bool emit_decimal_point> struct DoubleToStringConverterFlags
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{
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static constexpr auto flags = double_conversion::DoubleToStringConverter::NO_FLAGS;
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};
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template <> struct DoubleToStringConverterFlags<true>
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{
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static constexpr auto flags = double_conversion::DoubleToStringConverter::EMIT_TRAILING_DECIMAL_POINT;
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};
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template <bool emit_decimal_point>
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class DoubleConverter : private boost::noncopyable
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{
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DoubleConverter(const DoubleConverter &) = delete;
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DoubleConverter & operator=(const DoubleConverter &) = delete;
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DoubleConverter() = default;
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public:
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/// Sign (1 byte) + DigitsBeforePoint + point (1 byte) + DigitsAfterPoint + zero byte.
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/// See comment to DoubleToStringConverter::ToFixed method for explanation.
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static constexpr auto MAX_REPRESENTATION_LENGTH =
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1 + double_conversion::DoubleToStringConverter::kMaxFixedDigitsBeforePoint +
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1 + double_conversion::DoubleToStringConverter::kMaxFixedDigitsAfterPoint + 1;
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using BufferType = char[MAX_REPRESENTATION_LENGTH];
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static const double_conversion::DoubleToStringConverter & instance();
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};
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}
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