Re: [Boost-users] boost tti has_member_function

Subject: Re: [Boost-users] boost tti has_member_function
From: Edward Diener (eldiener_at_[hidden])
Date: 2014-05-08 13:06:14

On 5/7/2014 12:44 AM, Edward Diener wrote:
> On 5/5/2014 12:34 PM, Matei David wrote:
>> I'm trying to use boost tti has_member_function to test if a
>> user-specified allocator has the expected methods. However, this fails
>> with standard allocators.
>>
>> #include <iostream>
>> #include <memory>
>> #include <boost/tti/has_member_function.hpp>
>> BOOST_TTI_HAS_MEMBER_FUNCTION(deallocate)
>> typedef std::allocator< int > T;
>> int main()
>> {
>>      std::cout << has_member_function_deallocate<
>>          void (T::*) (T::pointer, T::size_type)
>>      >::value << "\n";
>> }
>>
>> I tried gcc-4.8.2 and clang-3.4. I'm compiling with:
>> {g++|clang++} -std=c++11 -I${BOOST}/include -Wall -Wextra
>> -pedantic -Wno-ignored-qualifiers -g3 -O0
>>
>> In both cases, I get a 0. However, using "-E" and grep-ing for
>> "\<deallocate\>", I see this signature:
>>
>> void deallocate(pointer __p, size_type)
>>
>> Shouldn't I be getting a 1? Am I using it the wrong way?
>
> There is no member function called 'deallocate' in the class
> std::allocator<T>. There is an inherited 'deallocate' function but TTI
> cannot currently identify inherited types, data, or functions.

I need to correct that last statement. TTI cannot currently identify 
inherited types, data, and functions if they are protected, but it can 
if they are public.