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//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2013-2013. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/container for documentation.
//
//////////////////////////////////////////////////////////////////////////////
#ifndef BOOST_CONTAINER_TEST_DEFAULT_INIT_TEST_HEADER
#define BOOST_CONTAINER_TEST_DEFAULT_INIT_TEST_HEADER
#include <boost/container/detail/config_begin.hpp>
#include <boost/container/throw_exception.hpp>
#include <boost/move/detail/force_ptr.hpp>
#include <cstddef>
namespace boost{
namespace container {
namespace test{
//
template<int Dummy = 0>
class default_init_allocator_base
{
protected:
static unsigned char s_pattern;
static bool s_ascending;
public:
static void reset_pattern(unsigned char value)
{ s_pattern = value; }
static void set_ascending(bool enable)
{ s_ascending = enable; }
};
template<int Dummy>
unsigned char default_init_allocator_base<Dummy>::s_pattern = 0u;
template<int Dummy>
bool default_init_allocator_base<Dummy>::s_ascending = true;
template<class Integral>
class default_init_allocator
: public default_init_allocator_base<0>
{
typedef default_init_allocator_base<0> base_t;
public:
typedef Integral value_type;
default_init_allocator()
{}
template <class U>
default_init_allocator(default_init_allocator<U>)
{}
Integral* allocate(std::size_t n)
{
const std::size_t max_count = std::size_t(-1)/(2*sizeof(Integral));
if(BOOST_UNLIKELY(n > max_count))
throw_bad_alloc();
//Initialize memory to a pattern
const std::size_t max = sizeof(Integral)*n;
unsigned char *puc_raw = ::new unsigned char[max];
if(base_t::s_ascending){
for(std::size_t i = 0; i != max; ++i){
puc_raw[i] = static_cast<unsigned char>(s_pattern++);
}
}
else{
for(std::size_t i = 0; i != max; ++i){
puc_raw[i] = static_cast<unsigned char>(s_pattern--);
}
}
return move_detail::force_ptr<Integral*>(puc_raw);
}
void deallocate(Integral *p, std::size_t)
{ delete[] (unsigned char*)p; }
};
template<class Integral>
inline bool check_ascending_byte_pattern(const Integral&t)
{
const unsigned char *pch = &reinterpret_cast<const unsigned char &>(t);
const std::size_t max = sizeof(Integral);
for(std::size_t i = 1; i != max; ++i){
if( (pch[i-1] != ((unsigned char)(pch[i]-1u))) ){
return false;
}
}
return true;
}
template<class Integral>
inline bool check_descending_byte_pattern(const Integral&t)
{
const unsigned char *pch = &reinterpret_cast<const unsigned char &>(t);
const std::size_t max = sizeof(Integral);
for(std::size_t i = 1; i != max; ++i){
if( (pch[i-1] != ((unsigned char)(pch[i]+1u))) ){
return false;
}
}
return true;
}
template<class IntDefaultInitAllocVector>
bool default_init_test()//Test for default initialization
{
const std::size_t Capacity = 100;
{
test::default_init_allocator<int>::reset_pattern(0);
test::default_init_allocator<int>::set_ascending(true);
IntDefaultInitAllocVector v(Capacity, default_init);
typename IntDefaultInitAllocVector::iterator it = v.begin();
//Compare with the pattern
for(std::size_t i = 0; i != Capacity; ++i, ++it){
if(!test::check_ascending_byte_pattern(*it))
return false;
}
}
{
test::default_init_allocator<int>::reset_pattern(0);
test::default_init_allocator<int>::set_ascending(true);
IntDefaultInitAllocVector v(Capacity, default_init, typename IntDefaultInitAllocVector::allocator_type());
typename IntDefaultInitAllocVector::iterator it = v.begin();
//Compare with the pattern
for(std::size_t i = 0; i != Capacity; ++i, ++it){
if(!test::check_ascending_byte_pattern(*it))
return false;
}
}
{
test::default_init_allocator<int>::reset_pattern(100);
test::default_init_allocator<int>::set_ascending(false);
IntDefaultInitAllocVector v;
v.resize(Capacity, default_init);
typename IntDefaultInitAllocVector::iterator it = v.begin();
//Compare with the pattern
for(std::size_t i = 0; i != Capacity; ++i, ++it){
if(!test::check_descending_byte_pattern(*it))
return false;
}
}
return true;
}
} //namespace test{
} //namespace container {
} //namespace boost{
#include <boost/container/detail/config_end.hpp>
#endif //BOOST_CONTAINER_TEST_DEFAULT_INIT_TEST_HEADER
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