typedef unsigned long long int uint64;//这里的64是指64位,不是64字节; 定义了一个无符号的长长整型unit64; unit64 a;//定义了一个无符号的长长整型变量a; typedef int Arr[10];//这个比较难理解;去掉typedef,定义了一个长度为10的 整型数组变量Arr,然后加上typedef,定义了一个整型数组类型Arr; Arr a...
使用using与typedef来定义别名 在C++中,using与typedef这两个关键词是大家用的比较多的,using关键词用的最多的是using namespace的搭配如using namespace std;而typedef用来设为某个类型设置一个别名,如typedef unsigned long long uint64;不过,可能有些不知道,其实using也可以用来设置别名,在这种情况下,它与typedef...
在VC中不支持这样的表示，是用_int64表示，参考资料：http://www.byvoid.com/blog/c-int64/
typedef unsignedlonglonguint64_t;#define__int64_t_defined 1#elif__STDINT_EXP(INT_MAX) > 0x7ffffffftypedef signedintint64_t; typedef unsignedintuint64_t;#define__int64_t_defined 1#endif 继续查找,发现我们代码中的某一个头文件中有这样的定义: #ifndef uint64_t#defineuint64_t unsigned long l...
typedef unsigned short int uint16_t; typedef unsigned int uint32_t; typedef unsigned long long uint64_t; typedef signed char s8; typedef signed short int s16; typedef signed int s32; typedef signed long long int s64; typedef unsigned char u8; ...
long long ago, 整形数据比较混乱，int / long int / long long int / unsigned long long int，越...
unsigned int :2个字节 float:4个字节 double:8个字节 long:4个字节 long long:8个字节 unsigned long:4个字节 32位编译器 char :1个字节 char*(即指针变量):4个字节(32位的寻址空间是2^32, 即32个bit,也就是4个字节。同理64位编译器)
4个字节(*指针变量)(16&32&64位机各不相同)shortint// 2个字节int// 4个字节(16位-2B,32&64位-4B(Byte))unsignedint// 4个字节(16位-2B,32&64位-4B)float// 4个字节double// 8个字节long// 4个字节(16&32位-4B,64位-8B)longlong// 8个字节unsignedlong// 4个字节(16&32位-4B,64位-...
typedefunsigned__int64 uint64; #else typedefunsignedlonglonguint64;//NOLINT #endif/*COMPILER_MSVC*/ OpenCV defined: typedefint64_tint64;typedefuint64_tuint64; https://github.com/opencv/opencv/blob/197285d12a8aa8c5b799f17f41089ac85db5f5bc/modules/core/include/opencv2/core/hal/interface.h#L61...
For example, in C++ one could use the ulong as a shorter version of unsigned long and use it throughout the code by first using the typedef statement below:typedef unsigned long ulong;In contrast to the class, struct, union, and enum declarations, typedef declarations do not introduce new ...