Macro generate_seeds 

macro_rules! generate_seeds {
    ($length: expr) => { ... };
}

Macro to generate an array of random seeds in a std environment.

This macro produces a u32 array of a specified length, where each element is derived from the current system time since the UNIX epoch. The generated seeds can be used for initializing random number generators.

Parameters

• $length: usize - The length of the array to be generated.

Implementation Details

1. Initialization:

   • A mutable array array of size $length is created and initialized with zeros ([0_u32; $length]).

2. System Time:

   • The current system time is retrieved using std::time::SystemTime::now().
   • The duration since the UNIX epoch is calculated using duration_since(std::time::UNIX_EPOCH).
   • If the system clock is misconfigured (e.g., time moves backwards), it will panic with an error message.

3. Seed Generation Logic:

   • Each element of the array is assigned a value based on the index i modulo 6. This ensures that a mix of time-based values is used to generate diverse seeds:
     • Case 0: The seed is derived from the number of milliseconds since the epoch (as_millis).
     • Case 1: The seed is the maximum u32 value minus the nanoseconds since the epoch (as_nanos).
     • Case 2: The seed is the number of seconds since the epoch divided by 60.
     • Case 3: The seed is the maximum u32 value minus the microseconds since the epoch (as_micros).
     • Case 4: The seed is the number of seconds since the epoch.
     • Case 5: The seed is the number of milliseconds since the epoch divided by 60.
     • Default Case: If the index doesn’t match any case (which is improbable), it assigns a fixed value of 1_192_765_u32.

4. Return Value:

   • The populated array is returned, providing a set of random seeds.

Example Usage

use rand_simple::generate_seeds;
// Generate an array of 5 random seeds
let seeds = generate_seeds!(5);
println!("Generated seeds: {:?}", seeds);

// The resulting `seeds` array will contain 5 `u32` values derived from the current system time.

Notes

• The seeds generated are dependent on the system time and provide a level of randomness sufficient for most applications.
• This macro is designed to work in environments where std is available, as it relies on std::time::SystemTime.