Credo che la mia comprensione di boost :: mpl :: set debba essere fondamentalmente difettosa. Pensavo che permettesse solo tipi unici.perché il boost di mpl set consente tipi non univoci
Ma il seguente codice compila:
#include <boost/mpl/set.hpp>
#include <boost/mpl/vector.hpp>
#include <boost/mpl/accumulate.hpp>
#include <boost/mpl/plus.hpp>
#include <boost/mpl/int.hpp>
#include <boost/mpl/placeholders.hpp>
#include <boost/mpl/sizeof.hpp>
#include <boost/mpl/assert.hpp>
using namespace boost::mpl;
typedef set<long,float,long> my_set; //long repeated in set?
typedef vector<long,float,long> my_vec; //seems reasonable
typedef accumulate<
my_set
, int_<0>
, plus<_1, sizeof_<_2>>
>::type set_size;
typedef accumulate<
my_vec
, int_<0>
, plus<_1, sizeof_<_2>>
>::type vec_size;
BOOST_MPL_ASSERT_RELATION(vec_size::value, ==, sizeof(long)+sizeof(float)+sizeof(long));
//why does the following line compile?
//shouldn't the size be sizeof(long)+sizeof(float) instead?
BOOST_MPL_ASSERT_RELATION(set_size::value, ==, sizeof(long)+sizeof(float)+sizeof(long));
È 'typedef set my_vec;' pensato per essere 'typedef vector my_vec;'? –
Mankarse
sì grazie per il fixing –