Mixin class that provides helper randomness functions.
Declared in <random.h>
template<typename T>
class RandomMixin;Intended to be used through CRTP: https://en.cppreference.com/w/cpp/language/crtp. An RNG class FunkyRNG would derive publicly from RandomMixin<FunkyRNG>. This permits RandomMixin from accessing the derived class's rand64() function, while also allowing the derived class to provide more.
The derived class must satisfy the RandomNumberGenerator concept.
| Name | Description |
|---|---|
result_type | Result type of the generator, for the UniformRandomBitGenerator concept. |
| Name | Description |
|---|---|
RandomMixin [constructor] | Constructors |
operator= | Assignment operators |
fillrand | Fill a span with random bytes. |
operator() | Generate the next random value, for the UniformRandomBitGenerator concept. |
rand | Generate a random integer in its entire (non-negative) range. |
rand256 | generate a random uint256. |
rand32 | Generate a random 32-bit integer. |
rand_exp_duration | Return a duration sampled from an exponential distribution (https://en.wikipedia.org/wiki/Exponential_distribution). Successive events whose intervals are distributed according to this form a memoryless Poisson process. This should be used for repeated network events (e.g. sending a certain type of message) to minimize leaking information to observers. |
rand_uniform_delay | Return the time point advanced by a uniform random duration. |
rand_uniform_duration | Generate a uniform random duration in the range from 0 (inclusive) to range (exclusive). |
randbits | randbits overloads |
randbool | Generate a random boolean. |
randbytes | randbytes overloads |
randrange | randrange overloads |
| Name | Description |
|---|---|
max | Largest value the generator can produce. |
min | Smallest value the generator can produce. |
| Name | Description |
|---|---|
FlushCache | Discard any random bits buffered from a previous rand64() call. |
| Name | Description |
|---|---|
FastRandomContext | Fast randomness source. This is seeded once with secure random data, but is completely deterministic and does not gather more entropy after that. |
InsecureRandomContext | xoroshiro128++ PRNG. Extremely fast, not appropriate for cryptographic purposes. |