On 09/03/10 15:46, Dave Abrahams wrote:
On Fri, Sep 3, 2010 at 2:52 PM, Larry Evans <cppljevans@suddenlink.net> wrote:
And why would a C++ programmer care about making the implementation of beta-reduction easier?
I thought that's essentially what mpl::apply<F,A> does. Let's see, from:
http://en.wikipedia.org/wiki/%CE%91_conversion#.CE.B1-conversion
I've already read it; I know what it is.
Yes, I figured that; however, that made me wonder why you asked the question. The only way I could answer the question, I thought, was to provide the reference. Besides, even though you are familiar with it, others reading the thread might not be, which is another reason why the reference was provided. Sorry, I didn't mean to imply that you didn't know about it. I guess the reason is that the question was asked from the perspective of the user, not the implementer, of the library. That perspective is also suggested by your followup statement:
this would make it easier for bind library writers at the expense of usability
Since, as I mentioned, I had trouble understanding how apply worked, and the code seems pretty complicated, at least to me, I was hoping DeBruijn's method would offer simplifications.
From the examples I've seen so far, this would make it easier for bind library writers at the expense of usability. On th other hand, once lambdas start to use protect() I'm usually giving up on them ;-)
OK, but at the time I was having trouble, I didn't know of an alternative. I'll try to remember the particulars of the problem I had to illustrate the point. That also might give Mr. Sankel another use case. -respectfully Larry