From: David Abrahams (david.abrahams_at_[hidden])
Date: 2001-11-20 06:10:54
I agree on all counts.
It's easy to make a friendly version for broken compilers (see the MPL, once
template <bool flag, class T, class F>
struct select_type : if_true<flag>::template then<T,F>
This is the standard MSVC "poor man's partial specialization" workaround.
----- Original Message -----
From: "Andrei Alexandrescu" <andrewalex_at_[hidden]>
Sent: Tuesday, November 20, 2001 3:09 AM
Subject: [boost] select_type.hpp
> I think if_true in select_type ought to become a first-class citizen. It's
> useful enough to everyone.
> I also suggest including the friendlier version:
> template <bool flag, typename T, typename U>
> struct select
> typedef T type;
> template <typename T, typename U>
> struct Select<false, T, U>
> typedef U type;
> for compilers that support partial specialization. The if_true is
> compiler-friendlier but considerably harder to use (that "template" in the
> middle of it is really annoying).
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