aligned_alloc 是线程安全的:它表现得如同只访问通过其参数可见的内存区域,而非任何静态存储。 解分配一块内存区域的先前 free、 free_sized 及free_aligned_sized(C23 起) 或realloc 调用同步于分配同一块或部分相同的内存区域的 aligned_alloc 调用。此同步出现于任何通过解分配函数所作的内存访问之后,和任何 al...
作为“实现支持”要求的例子,POSIX 函数 posix_memalign 接受任何是二的幂且为 sizeof(void*) 倍数的 alignment,而基于 POSIX 的 aligned_alloc 实现继承此要求。 基础对齐始终得到支持。若 alignment 是二的幂且不大于 alignof(std::max_align_t),则 aligned_alloc 可以简单地调用 std::malloc。
#include <cstdlib>#include <iostream>#include <memory>#include <string>intmain(){constchar*v[]={"This","is","an","example"};autosz=std::size(v);if(void*pbuf=std::aligned_alloc(alignof(std::string), sizeof(std::string)*sz)){try{autofirst=static_cast<std::string*>(pbuf);autola...
aligned_alloc<char>()){*p='a';std::cout<<"allocated a char at "<<(void*)p<<'\n';}// allocate an intif(int*p=a.aligned_alloc<int>()){*p=1;std::cout<<"allocated an int at "<<(void*)p<<'\n';}// allocate an int, aligned at 32-byte boundaryif(int*p=a.aligned_alloc...
lastMessage = pathStr; 742 dvmAbort(); 743 } 744 745 LOGVV(" (filled %d of %d slots)", idx, count); 746 747 /* put end marker in over-alloc slot */ 748 cpe[idx].kind = kCpeLastEntry; 749 cpe[idx].fileName = NULL; 750 cpe[idx].ptr = NULL; 751 752 //dumpClassPath(cpe...
oneMKL error handling relies on the mechanism of C++ exceptions. Should errors occur, they are propagated at the point of a function call where they are caught using standard C++ error handling mechanisms. Exception Classification Exception classification in oneMKL is aligned with C++ Standard Library...
tile_height);/* Offset must be aligned to 2K and must point at the beginning * of a scanline. */offset = surface->offset + tex->desc.stride_in_bytes[level] * surface->cbzb_height; surface->cbzb_midpoint_offset = offset & ~2047; ...
全局new 运算符和delete 运算符的用户替换版本 std::calloc、std::malloc、std::realloc、std::aligned_alloc(C++17 起)、std::free 对这些分配或解分配特定存储单元的函数调用以单独全序出现,而并且在此顺序中,每个解分配调用先发生于下个分配(如果存在)。 (C++11 起)参数...
std::aligned_alloc (C++17 起)调用下列对象表示复制函数,此时在目标存储区域或结果中创建这种对象: std::memcpy std::memmove std::bit_cast (C++20 起)调用下列特定的函数,此时在指定的存储区域中创建对象: std::start_lifetime_as std::start_lifetime_as_array (C++23 起)同一存储区域中可以创建零或...
std::calloc,std::malloc,std::realloc,std::aligned_alloc(since C++17),std::free Calls to these functions that allocate or deallocate a particular unit of storage occur in a single total order, and each such deallocation callhappens-beforethe next allocation (if any) in this order. ...