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refactor: make GetRand a template, remove GetRandInt

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pasta
2022-01-31 19:32:59 +07:00
parent 505ba39665
commit ab1ea29ba1
12 changed files with 34 additions and 31 deletions
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13
src/random.h
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@@ -69,7 +69,17 @@
*/
void GetRandBytes(Span<unsigned char> bytes) noexcept;
/** Generate a uniform random integer in the range [0..range). Precondition: range > 0 */
uint64_t GetRand(uint64_t nMax) noexcept;
uint64_t GetRandInternal(uint64_t nMax) noexcept;
/** Generate a uniform random integer of type T in the range [0..nMax)
* nMax defaults to std::numeric_limits<T>::max()
* Precondition: nMax > 0, T is an integral type, no larger than uint64_t
*/
template<typename T>
T GetRand(T nMax=std::numeric_limits<T>::max()) noexcept {
static_assert(std::is_integral<T>(), "T must be integral");
static_assert(std::numeric_limits<T>::max() <= std::numeric_limits<uint64_t>::max(), "GetRand only supports up to uint64_t");
return T(GetRandInternal(nMax));
}
/** Generate a uniform random duration in the range [0..max). Precondition: max.count() > 0 */
template <typename D>
D GetRandomDuration(typename std::common_type<D>::type max) noexcept
@@ -95,7 +105,6 @@ constexpr auto GetRandMillis = GetRandomDuration<std::chrono::milliseconds>;
* */
std::chrono::microseconds GetExponentialRand(std::chrono::microseconds now, std::chrono::seconds average_interval);
int GetRandInt(int nMax) noexcept;
uint256 GetRandHash() noexcept;
/**