On Wednesday, 16 April 2025 at 14:48:04 UTC, H. S. Teoh wrote:
Pointers can be used perfectly fine in @safe. Just not unsafe
operations like pointer arithmetic.
So, apart from stdout.flush(), is it perfect to use the following
code with @safe:
```d
import std.stdio, std.random;
import std.random : ups = unpredictableSeed;
import core.stdc.stdlib : rand, RAND_MAX;
alias T = double; // float;
enum N = int.max; // long.max;
auto phobosRandom()
=> cast(T)Random(ups).front / N;
auto stdlibRandom()
=> cast(T)rand() / RAND_MAX;
@safe:
struct RandGroup
{
string name;
T function() gene;
T up = 0.9;
T down = 0.1;
} /* Prints:
0.10826: Testing uniform...
0.493747: Testing Phobos...
0.840188: Testing StdLib...
//*/
void main()
{
RandGroup[3] funcs = [
{
name: "uniform",
gene: () => uniform(0.0, 1.0),
//down: 0.01, up: 0.02
}, {
name: "Phobos",
gene: &phobosRandom,
}, {
name: "StdLib",
gene: &stdlibRandom,
},
];
foreach (func; funcs)
{
with(func)
{
auto generate = gene();
generate.write(": ");
writeln("Testing ", name, "...");
//stdout.flush(); // error
}
}
}
```
SDB@79
