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Subject: Re: [boost] C++11 Metaprogramming
From: Christopher Jefferson (chris_at_[hidden])
Date: 2012-04-02 04:47:35

On 1 Apr 2012, at 22:07, Nathan Ridge wrote:

>> From a pure meta-programming perspective, I guess the only real
>> addition is variadic templates.
>> However, there is the problem that they're fairly limited and that one
>> may not expand them as the arguments of a non-variadic template.
> I thought that was allowed. At least, GCC supports it since 4.7, and its
> error message for it in 4.6 was
> "sorry, unimplemented: cannot expand 'Args ...' into a fixed-length argument list"
> which suggests the feature is not an extension.

There is a workaround for this, redirect through another layer of templates

template<template <typename...> T, typename... Args>
struct Join
{ typedef T<Args...> type; };


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