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Add templated GetRandomDuration<>

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MarcoFalke
2020-04-27 09:25:05 -04:00
parent af2ec6b037
commit fa0e5b89cf
2 changed files with 16 additions and 16 deletions
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16
src/random.h
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@@ -67,9 +67,21 @@
* Thread-safe.
*/
void GetRandBytes(unsigned char* buf, int num) noexcept;
/** Generate a uniform random integer in the range [0..range). Precondition: range > 0 */
uint64_t GetRand(uint64_t nMax) noexcept;
std::chrono::microseconds GetRandMicros(std::chrono::microseconds duration_max) noexcept;
std::chrono::milliseconds GetRandMillis(std::chrono::milliseconds duration_max) noexcept;
/** 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
// Having the compiler infer the template argument from the function argument
// is dangerous, because the desired return value generally has a different
// type than the function argument. So std::common_type is used to force the
// call site to specify the type of the return value.
{
assert(max.count() > 0);
return D{GetRand(max.count())};
};
constexpr auto GetRandMicros = GetRandomDuration<std::chrono::microseconds>;
constexpr auto GetRandMillis = GetRandomDuration<std::chrono::milliseconds>;
int GetRandInt(int nMax) noexcept;
uint256 GetRandHash() noexcept;