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Merge branch 'fix-bad-parsing-error-message' of github.com:yandex/ClickHouse into fix-bad-parsing-error-message

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Alexey Milovidov 2019-02-25 23:17:33 +03:00
commit f151ebd60a
1 changed files with 13 additions and 15 deletions
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28
libs/libcommon/include/common/itoa.h
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@ -72,38 +72,36 @@ struct Division
};
/// Select a type with appropriate number of bytes from the list of types.
/// First parameter is the number of bytes requested. Second parameter is the number of bytes in the first type in the list.
/// The list goes in increasing order: subsequent type is 2x large than the previous.
/// Example: SelectType<4, 2, uint16_t, uint32_t, uint64_t> will select uint32_t.
template <size_t, size_t, typename...>
struct SelectType;
/// When size matches, select the first type from the list.
/// First parameter is the number of bytes requested. Then goes a list of types with 1, 2, 4, ... number of bytes.
/// Example: SelectType<4, uint8_t, uint16_t, uint32_t, uint64_t> will select uint32_t.
template <size_t N, typename T, typename... Ts>
struct SelectType<N, N, T, Ts...> { using Result = T; };
struct SelectType
{
using Result = typename SelectType<N / 2, Ts...>::Result;
};
template <typename T, typename... Ts>
struct SelectType<1, T, Ts...>
{
using Result = T;
};
/// Shift the list and proceed recursively.
template <size_t N, size_t M, typename T, typename... Ts>
struct SelectType<N, M, T, Ts...> { using Result = typename SelectType<N, 2 * M, Ts...>::Result; };
/// Division by 10^N where N is the size of the type.
template <size_t N>
using DivisionBy10PowN = typename SelectType
<
N,
1,
Division<uint8_t, 0, 205U, 11>, /// divide by 10
Division<uint16_t, 1, 41943U, 22>, /// divide by 100
Division<uint32_t, 0, 3518437209U, 45>, /// divide by 10000
Division<uint64_t, 0, 12379400392853802749ULL, 90>, /// divide by 100000000
Division<uint128_t, 0, 0U, 0>
Division<uint64_t, 0, 12379400392853802749ULL, 90> /// divide by 100000000
>::Result;
template <size_t N>
using UnsignedOfSize = typename SelectType
<
N,
1,
uint8_t,
uint16_t,
uint32_t,