Re: RAII and classes

[John Colvin via Digitalmars-d-learn]

On Wednesday, 9 March 2016 at 10:48:30 UTC, cym13 wrote:

On Wednesday, 9 March 2016 at 10:28:06 UTC, John Colvin wrote:

Potential for leaking references from alias this aside, is there some reason that I shouldn't do this for all my C++-like RAII needs:

class A
{
        ~this(){ import std.stdio; writeln("hello"); }
}

auto RAII(T)()
if (is(T == class))
{
        struct Inner
        {
                private ubyte[__traits(classInstanceSize, T)] buff;
                T c;
                alias c this;
                
                ~this()
                {
                        destroy(c);
                }
        }
        Inner tmp;
        import std.conv : emplace;
        tmp.c = tmp.buff.emplace!T;
        return tmp;
}

void main()
{
        auto a = RAII!A;
}

That's almost literally what std.typecons.scoped does.

Ok, I forgot std.typecons.scoped, nothing to see here .....