The standard says that SIZE_MAX must be at least 65535. It specifies no upper bound, and gcc's implementation is perfectly valid. Quoting the reference you cited (emphasis added): Its implementation-defined value shall be equal to or greater in magnitude (absolute value) than the corresponding value given below, with the same sign.

本篇目的：理解C++之vector关于容量成员函数size、max_size、resize、capacity、empty、reserve、shrink_to_fit用法。 size () :作用：返回容器中元素的数量。 用法 ：使用 size () 函数可以获取容器中元素的数量。

2021年11月7日 · Maximum number of elements. Constant. This value typically reflects the theoretical limit on the size of the container, at most std::numeric_limits<difference_type>::max(). At runtime, the size of the container may be limited to a value smaller than max_size () by the amount of RAM available.

2024年11月21日 · In C++, vector max_size() is a built-in function used to find the maximum number of elements that can be held by the vector container. In this article, we will learn about the vector max_size() function in C++.

max_size() is the theoretical maximum number of items that could be put in your vector. On a 32-bit system, you could in theory allocate 4Gb == 2^32 which is 2^32 char values, 2^30 int values or 2^29 double values.

此值通常反映容器大小上的理论极限，至多为 std::numeric_limits<difference_type>::max() 。 运行时，可用 RAM 总量可能会限制容器大小到小于 max_size() 的值。

该宏表示 size_t 类型的最大值。 宏 SIZE_MAX 值应不小于 65535，具体值由实现定义。 具体实现中，该宏应替换为适合在 #if 预处理指令中使用的常量表达式，并且该表达式应具有与相应对象类型（整数提升后）相同的类型。 #include <stdio.h> int main(void) printf("SIZE_MAX = %zu\n", SIZE_MAX); return 0; 表示 sizeof 运算符运算结果的无符号整数类型。 SIZE_MAX宏 宏定义：#define SIZE_MAX value 该宏表示size_t类型的最大值。 宏SIZE_MAX值应不小于65535， …

2015年5月27日 · In the current C++11/14 standard, SIZE_MAX is introduced and mentioned only in <cstdint>. It is also part of C99 , of which specification C++11 fully includes via the <cxxx> headers. So it seems it was not defined prior to C++11.

Returns the maximum number of elements that the vector can hold. This is the maximum potential size the container can reach due to known system or library implementation limitations, but the container is by no means guaranteed to be able to reach that size: it can still fail to allocate storage at any point before that size is reached.

Returns the maximum number of elements the container is able to hold due to system or library implementation limitations, i.e. std::distance(begin(), end()) for the largest container. Parameters (none)