Roll a die
12345678910 | #include <random>
int main()
{
std::random_device random_device;
std::mt19937 random_engine{random_device()};
std::uniform_int_distribution<int> die_distribution{1, 6};
int die_roll = die_distribution(random_engine);
} |
This pattern is licensed under the CC0 Public Domain Dedication.
Intent
Generate a random integer according to a uniform distribution.
Description
The std::random_device on line 5
provides a source of uniform non-deterministic random numbers
(where such a source is available). We use this to seed the
Mersenne Twister random number engine,
std::mt19937, on
line 6. Consider other random number
engines
for different properties.
On line 7, we create a
std::uniform_int_distribution
representing a uniform random distribution of integers from 1 to 6
inclusive. That is, each value from 1 to 6 has an equal chance of
occurring.
Finally, we generate a random number from the random engine, distributed according to the uniform integer distribution (line 9). This gives us a random integer from 1 to 6, as though we had rolled a 6-sided die.
To generate further random numbers, simply call
die_distribution(random_engine) again.
