std::uniform_int_distribution isn't random enough

Question

I want to randomly select an integer among n numbers, where n is small (say 5). To do this, I am using std::uniform_int_distribution.

The exact details

Answer 1

Try to seed the random engine. Time is a good choice. Read this to get familiar to another ways.

std::default_random_engine generator( (unsigned int)time(0) );

or you can use std::random_device which tries to produce non-deterministic random numbers

std::default_random_engine generator( std::random_device{}() ); 

std::random_device is a uniformly-distributed integer random number generator that produces non-deterministic random numbers.

Note that std::random_device may be implemented in terms of a pseudo-random number engine if a non-deterministic source (e.g. a hardware device) is not available to the implementation.

It uses a hardware random generator device or generates a pseudo random number. Useful to seed.