[LLVMdev] select1st, select2nd

Chris Lattner clattner at apple.com
Fri Jul 15 13:54:30 PDT 2011

On Jul 15, 2011, at 1:37 PM, Scott Conger wrote:

> I believe he's referring to this:
> http://www.sgi.com/tech/stl/select1st.html

I'm familiar with it.  I'm asking why it is better to use it than an explicit loop.


> On Fri, Jul 15, 2011 at 1:29 PM, Chris Lattner <clattner at apple.com> wrote:
>> On Jul 15, 2011, at 12:35 PM, David Greene wrote:
>>> I've run into a use case where I'd like to use a mapped_iterator to
>>> iterator the 1st (or 2nd) items in a sequence of std::pairs.  Does
>>> select1st/select2nd exist somewhere within LLVM or is there some
>>> equivalent?  If not, I'll add it.
>> Is this making the resultant loop simpler?  C++ without lambda's isn't very friendly to functors, what is the before/after effect of doing this?
>> -Chris
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