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