slices ; Stroustrup & libstdc++

[Gabriel Dos Reis]

Gerhard Wesp <gwesp@cosy.sbg.ac.at> writes:

|   hi all,
| 
|   i just tried a slice_array example from stroustrup, 3rd ed., p. 671
| which fails with the following error:
| 
| grisu ~/c++% cat slice.cc 
| #include <valarray>
| 
| void f(std::valarray<double>& d)
| {
|   std::slice_array<double>& v_even = d[std::slice(0,d.size()/2,2)];
                            ^

This is ill-formed: you can't bind a non-const reference to a
temporary. The two versions of valarray<T>::operator[](slice) return
by *value*.

-- Gaby