std::size_t 可以存放下理论上可能存在的对象的最大大小,该对象可以是任何类型(包括数组)。大小无法以 std::size_t 表示的类型是非良构的。在许多平台上(使用分段寻址的系统除外),std::size_t 可以存放任何非成员的指针的值,此时它与 std::uintptr_t 同义。
size_t 是offsetof、sizeof 和_Alignof(C23 前)alignof(C23 起) 的结果的无符号整数类型,定义取决于数据模型。 size_t 的位宽不小于 16。 (C99 起) 注解 size_t 能存储理论上可行的任何类型(包括数组)对象的最大大小。 size_t 通常用于数组下标和循环计数。将如 unsigned int 的其他类型用作数组下标的...
ptrdiff_t signed integer type returned when subtracting two pointers (typedef) offsetof byte offset from the beginning of a struct type to specified member (function macro) C++ documentation for size_t Retrieved from "https://en.cppreference.com/mwiki/index.php?title=c/types/size_t...
size_t :它是为了方便系统之间的移植而定义的 是一些C/C++标准在stddef.h中定义的，size_t 类型表示...
size_t is the unsigned integer type of the result of sizeof , alignof (since C11) and offsetof, depending on the data model. Notes size_t can store the maximum size of a theoretically possible object of any type (including array). size_t is commonly used for array indexing and loop...
sizeof(std::byte) (since C++17) sizeof(char8_t) (since C++20) sizeofcannot be used with function types, incomplete types, or bit-fieldlvalues(until C++11)glvalues(since C++11). When applied to a reference type, the result is the size of the referenced type. ...
这里我直接贴出cppreference中的示例代码: #include <iostream> #include <stdexcept> // C++11 constexprfunctionsuse recursion rather than iteration // (C++14 constexprfunctionsmay uselocalvariables and loops) constexpr int factorial(int n) {returnn <= 1 ? 1 : (n factorial(n - 1)); } ...
size_t - cppreference.comen.cppreference.com/w/c/types/size_t
Reference Feedback DefinitionNamespace: Microsoft.VisualStudio.TextManager.Interop Assembly: Microsoft.VisualStudio.Interop.dll Package: Microsoft.VisualStudio.Interop v17.12.40391 Gets the size preferences for the tip window. C++/WinRT 複製 int GetSizePreferences(std::Array <Microsoft...
size_t_msize(void*memblock ); Parameters memblock Pointer to the memory block. Return value _msizereturns the size (in bytes) as an unsigned integer. Remarks The_msizefunction returns the size, in bytes, of the memory block allocated by a call tocalloc,malloc, orrealloc. ...