[boost] Re: [utility] value_init fails on CW*

From: David Abrahams (dave_at_[hidden])
Date: 2004-09-01 20:40:33

Stefan Slapeta <stefan_nospam__at_[hidden]> writes:

> see http://tinyurl.com/5639d
>
> Has anybody a solution for this? Seems that all CWs have problems with
> casts in combination with conversion functions.

template<class T>
void test ( T const& y, T const& z )
{
  boost::value_initialized<T> x ;
  BOOST_TEST ( y == x ) ;
  BOOST_TEST ( y == get(x) ) ;
  static_cast<T&>(x) = z ;
  get(x) = z ;
  BOOST_TEST ( x == z ) ;

  boost::value_initialized<T> const x_c ;
  BOOST_TEST ( y == x_c ) ;
  BOOST_TEST ( y == get(x_c) ) ;
  static_cast<T&>(x_c) = z ;

### mwcc Compiler:
#    File: ..\libs\utility\value_init_test.cpp
# --------------------------------------------
#      76:   static_cast<T&>(x_c) = z ; 
#   Error:                            ^
#   constness casted away

The only solution I can think of is to change the test:

  T& t_ref = x_c;
  t_ref = z;

or

  implicit_cast<T&>(x_c) = z;

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com