Re: dynamically allocating on the stack

[Uknown via Digitalmars-d-learn]

On Saturday, 21 April 2018 at 07:37:50 UTC, Mike Franklin wrote:
Does D have some way to dynamically allocate on the stack?  I'm 
looking for something roughly equivalent to the following C 
code.

int doSomething(size_t len)
{
    char stackBuffer[len + 1];
    doSomethingElse(stackBuffer);
}

Thanks,
Mike

The language itself doesn't have something, but you could use 
`alloca`:

---
void doSomething(size_t len)
{
    import core.stdc.stdlib, core.stdc.stdio;

    auto stackBuffer = (cast(char*) alloca(char.sizeof * len + 
1))[0 .. len + 1];
    stackBuffer[0] = 'H';
    stackBuffer[1] = '\0';
    printf("%.*s", stackBuffer.ptr);
}

void main()
{
    doSomething(2);
}
---