std::vector<PointT,Eigen::aligned_allocator<PointT>>points;std::vector<Eigen::Matrix3d,Eigen::aligned_allocator<Eigen::Matrix3d>> 才发现,原来vector有两个模板形参,具体定义如下,,_Tp 是元素类型, _Alloc 负责提供 vector 需要用到的动态内存。其中 _Alloc 参数有默认值,一般的使用(如int, float等)不...
stl默认的空间分配器就是std::new_allocator,因为是new和delete的封装,一个std::allocator new的当然可以用另一个std::allocator来delete。 // 定义在<bits/allocator.h>中的allocator类模板中usingis_always_equal _GLIBCXX20_DEPRECATED_SUGGEST("std::allocator_traits::is_always_equal") = true_type;// 以...
The situation with std::vector was even worse (explanation below) so we had to specialize it for theEigen::aligned_allocatortype. In practice youmustuse theEigen::aligned_allocator(not another aligned allocator),and #include <Eigen/StdVector>. Here is an example: #include<Eigen/StdVector> /...
现在根据现象来对比std::vector内存申请的源码: // TEMPLATE FUNCTION _Allocatetemplate<class_Ty>inline_DECLSPEC_ALLOCATOR_Ty*_Allocate(size_t_Count,_Ty*,bool_Try_aligned_allocation=true){// allocate storage for _Count elements of type _Tyvoid*_Ptr=0;if(_Count==0)return(static_cast...
Does the memory you get back always end up as properly aligned data?Because of the nature of vector, it uses dynamic memory allocation, (operator new) to allocate this memory, and the default allocator for new is malloc. If you then dig into the documentation a bit, you will find the ...
StdVector.h:69:9: error: partial specialization of ‘std::vector<T, Eigen::aligned_allocator<U> >’ after instantiation of ‘std::vector<Eigen::Matrix<float, 4, 4>, Eigen::aligned_allocator<Eigen::Matrix<float, 4, 4> > >’ [-fpermissive] class vector<T,EIGEN_ALIGNED_ALLOCATOR<T> ...
小结:_Vector_base专门负责vector的内存管理,内部类_M_impl通过继承_Tp_alloc_type(也就是 allocator)得到内存分配释放的功能,_M_allocate 和_M_deallocate 分别分配和释放 vector 所用内存,vector 只需要负责元素构造和析构。 在vector 中,默认内存分配器为std::allocator<_Tp> 代码语言:javascript 代码运行次数:...
tbb::concurrent_vector<:CACHE_ALIGNED_ALLOCATOR><:DATA1D>,tbb::cache_aligned_allocator<:CACHE_ALIGNED_ALLOCATOR><:DATA1D>> >::push_back(myNameSpace::data1D&) Hi, it seems that you're declaring a vector of tbb::cache_aligned_allocators... First template par...
typename std::allocator_traits<_Alloc>::template rebind_alloc<_Tp> 1. 继续到allocator_traits中寻找 找到了: template<typename_Up>using rebind_alloc = allocator<_Up>; 1. 于是: std::allocator_traits<_Alloc>::template rebind_alloc<_Tp> ...
#6 0x557bafbcb952 in std::vector<std::aligned_storage<32ul, 8ul>, std::allocator<std::aligned_storage<32ul, 8ul> > >::vector(unsigned long, std::allocator<std::aligned_storage<32ul, 8ul> > const&) /usr/include/c++/10/bits/stl_vector.h:511 ...