本文整理汇总了C++中allocator_type::allocation_command方法的典型用法代码示例。如果您正苦于以下问题：C++ allocator_type::allocation_command方法的具体用法？C++ allocator_type::allocation_command怎么用？C++ allocator_type::allocation_command使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类allocator_type的用法示例。
在下文中一共展示了allocator_type::allocation_command方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1:
static size_type shrink_buckets
( bucket_ptr buckets, size_type old_size
, allocator_type &alloc, size_type new_size)
{
if(old_size <= new_size )
return old_size;
size_type received_size;
if(!alloc.allocation_command
(boost::interprocess::try_shrink_in_place | boost::interprocess::nothrow_allocation, old_size, new_size, received_size, buckets).first){
return old_size;
}
for( bucket_type *p = ipcdetail::to_raw_pointer(buckets) + received_size
, *pend = ipcdetail::to_raw_pointer(buckets) + old_size
; p != pend
; ++p){
p->~bucket_type();
}
bucket_ptr shunk_p = alloc.allocation_command
(boost::interprocess::shrink_in_place | boost::interprocess::nothrow_allocation, received_size, received_size, received_size, buckets).first;
BOOST_ASSERT(buckets == shunk_p); (void)shunk_p;
bucket_ptr buckets_init = buckets + received_size;
for(size_type i = 0; i < (old_size - received_size); ++i){
to_raw_pointer(buckets_init++)->~bucket_type();
}
return received_size;
}示例2: reuse
static bucket_ptr expand_or_create_buckets
( bucket_ptr old_buckets, const size_type old_num
, allocator_type &alloc, const size_type new_num)
{
size_type received_size = new_num;
bucket_ptr reuse(old_buckets);
bucket_ptr ret = alloc.allocation_command
(boost::interprocess::expand_fwd | boost::interprocess::allocate_new, new_num, received_size, reuse);
if(ret == old_buckets){
bucket_ptr buckets_init = old_buckets + old_num;
for(size_type i = 0; i < (new_num - old_num); ++i){
::new(to_raw_pointer(buckets_init++), boost_container_new_t())bucket_type();
}
}
else{
bucket_ptr buckets_init = ret;
for(size_type i = 0; i < new_num; ++i){
::new(to_raw_pointer(buckets_init++), boost_container_new_t())bucket_type();
}
}
return ret;
}示例3: new
static bucket_ptr expand_or_create_buckets
( bucket_ptr old_buckets, const size_type old_num
, allocator_type &alloc, const size_type new_num)
{
size_type received_size;
std::pair<bucket_ptr, bool> ret =
alloc.allocation_command
(boost::interprocess::expand_fwd | boost::interprocess::allocate_new, new_num, new_num, received_size, old_buckets);
if(ret.first == old_buckets){
bucket_ptr buckets_init = old_buckets + old_num;
for(size_type i = 0; i < (new_num - old_num); ++i){
new(to_raw_pointer(buckets_init++))bucket_type();
}
}
else{
bucket_ptr buckets_init = ret.first;
for(size_type i = 0; i < new_num; ++i){
new(to_raw_pointer(buckets_init++))bucket_type();
}
}
return ret.first;
}