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50 lines
1.9 KiB
C++
50 lines
1.9 KiB
C++
#pragma once
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#include <Core/Defines.h>
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#include <IO/WriteBuffer.h>
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#include <base/itoa.h>
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namespace
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{
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template <typename T> constexpr size_t max_int_width = 20;
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template <> inline constexpr size_t max_int_width<UInt8> = 3; /// 255
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template <> inline constexpr size_t max_int_width<Int8> = 4; /// -128
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template <> inline constexpr size_t max_int_width<UInt16> = 5; /// 65535
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template <> inline constexpr size_t max_int_width<Int16> = 6; /// -32768
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template <> inline constexpr size_t max_int_width<UInt32> = 10; /// 4294967295
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template <> inline constexpr size_t max_int_width<Int32> = 11; /// -2147483648
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template <> inline constexpr size_t max_int_width<UInt64> = 20; /// 18446744073709551615
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template <> inline constexpr size_t max_int_width<Int64> = 20; /// -9223372036854775808
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template <> inline constexpr size_t max_int_width<UInt128> = 39; /// 340282366920938463463374607431768211455
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template <> inline constexpr size_t max_int_width<Int128> = 40; /// -170141183460469231731687303715884105728
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template <> inline constexpr size_t max_int_width<UInt256> = 78; /// 115792089237316195423570985008687907853269984665640564039457584007913129639935
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template <> inline constexpr size_t max_int_width<Int256> = 78; /// -57896044618658097711785492504343953926634992332820282019728792003956564819968
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}
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namespace DB
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{
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namespace detail
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{
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template <typename T>
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void NO_INLINE writeUIntTextFallback(T x, WriteBuffer & buf)
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{
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char tmp[max_int_width<T>];
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char * end = itoa(x, tmp);
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buf.write(tmp, end - tmp);
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}
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}
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template <typename T>
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void writeIntText(T x, WriteBuffer & buf)
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{
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if (likely(reinterpret_cast<uintptr_t>(buf.position()) + max_int_width<T> < reinterpret_cast<uintptr_t>(buf.buffer().end())))
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buf.position() = itoa(x, buf.position());
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else
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detail::writeUIntTextFallback(x, buf);
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}
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}
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