Re: How can I do that in @nogc?

[TheFlyingFiddle via Digitalmars-d-learn]

On Wednesday, 25 February 2015 at 19:32:50 UTC, Namespace wrote:

How can I specify that 'func' is @nogc? Or can define the function otherwise?

An alternative solution would be to use function
templated on an alias.

import std.traits;
void glCheck(alias func)(string file = __FILE__,
                         size_t line = __LINE__) @nogc
    if(isCallable!func)
{
    func();
    glCheckError(file, line);
}


void foo() { new int(5); } //Uses GC
void bar() @nogc { /* ... */ } //Does not use GC

unittest
{
    //Calling is a little different
    glCheck!foo; //Does not compile not @nogc
    glCheck!bar; //Works like a charm.
}


//If you wanted to take arguments to func
//it can be done like this.
void glCheck(alias func,
             string file = __FILE__,
             size_t line = __LINE__,
             Args...)(auto ref Args args) @nogc
     if(isCallable!func)
{
    func(args);
    glCheckError(file, line);
}

void buz(string a, uint b, float c) @nogc { /* ... */ }

unittest
{
   //Calling looks like this.
   glCheck!buz("foobar", 0xBAADF00D, 42.0f);
}