ClickHouse/libs/libcommon/include/common/intExp.h

128 lines
4.0 KiB
C++

#pragma once
#include <cstdint>
#include <limits>
/// On overlow, the function returns unspecified value.
inline uint64_t intExp2(int x)
{
return 1ULL << x;
}
inline uint64_t intExp10(int x)
{
if (x < 0)
return 0;
if (x > 19)
return std::numeric_limits<uint64_t>::max();
static const uint64_t table[20] =
{
1ULL, 10ULL, 100ULL,
1000ULL, 10000ULL, 100000ULL,
1000000ULL, 10000000ULL, 100000000ULL,
1000000000ULL, 10000000000ULL, 100000000000ULL,
1000000000000ULL, 10000000000000ULL, 100000000000000ULL,
1000000000000000ULL, 10000000000000000ULL, 100000000000000000ULL,
1000000000000000000ULL, 10000000000000000000ULL
};
return table[x];
}
namespace common
{
inline int exp10_i32(int x)
{
static const int values[] = {
1,
10,
100,
1000,
10000,
100000,
1000000,
10000000,
100000000,
1000000000
};
return values[x];
}
inline int64_t exp10_i64(int x)
{
static const int64_t values[] = {
1ll,
10ll,
100ll,
1000ll,
10000ll,
100000ll,
1000000ll,
10000000ll,
100000000ll,
1000000000ll,
10000000000ll,
100000000000ll,
1000000000000ll,
10000000000000ll,
100000000000000ll,
1000000000000000ll,
10000000000000000ll,
100000000000000000ll,
1000000000000000000ll
};
return values[x];
}
inline __int128 exp10_i128(int x)
{
static const __int128 values[] = {
static_cast<__int128>(1ll),
static_cast<__int128>(10ll),
static_cast<__int128>(100ll),
static_cast<__int128>(1000ll),
static_cast<__int128>(10000ll),
static_cast<__int128>(100000ll),
static_cast<__int128>(1000000ll),
static_cast<__int128>(10000000ll),
static_cast<__int128>(100000000ll),
static_cast<__int128>(1000000000ll),
static_cast<__int128>(10000000000ll),
static_cast<__int128>(100000000000ll),
static_cast<__int128>(1000000000000ll),
static_cast<__int128>(10000000000000ll),
static_cast<__int128>(100000000000000ll),
static_cast<__int128>(1000000000000000ll),
static_cast<__int128>(10000000000000000ll),
static_cast<__int128>(100000000000000000ll),
static_cast<__int128>(1000000000000000000ll),
static_cast<__int128>(1000000000000000000ll) * 10ll,
static_cast<__int128>(1000000000000000000ll) * 100ll,
static_cast<__int128>(1000000000000000000ll) * 1000ll,
static_cast<__int128>(1000000000000000000ll) * 10000ll,
static_cast<__int128>(1000000000000000000ll) * 100000ll,
static_cast<__int128>(1000000000000000000ll) * 1000000ll,
static_cast<__int128>(1000000000000000000ll) * 10000000ll,
static_cast<__int128>(1000000000000000000ll) * 100000000ll,
static_cast<__int128>(1000000000000000000ll) * 1000000000ll,
static_cast<__int128>(1000000000000000000ll) * 10000000000ll,
static_cast<__int128>(1000000000000000000ll) * 100000000000ll,
static_cast<__int128>(1000000000000000000ll) * 1000000000000ll,
static_cast<__int128>(1000000000000000000ll) * 10000000000000ll,
static_cast<__int128>(1000000000000000000ll) * 100000000000000ll,
static_cast<__int128>(1000000000000000000ll) * 1000000000000000ll,
static_cast<__int128>(1000000000000000000ll) * 10000000000000000ll,
static_cast<__int128>(1000000000000000000ll) * 100000000000000000ll,
static_cast<__int128>(1000000000000000000ll) * 100000000000000000ll * 10ll,
static_cast<__int128>(1000000000000000000ll) * 100000000000000000ll * 100ll,
static_cast<__int128>(1000000000000000000ll) * 100000000000000000ll * 1000ll
};
return values[x];
}
}