C常用宏定义 Standard Macros — commonly-used macros

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本文介绍了GLib库中的几个实用宏定义，包括检查目录分隔符、计算最小值和最大值、绝对值及限制数值范围的方法。此外，还详细列出了用于不同位数整数的数据类型定义。

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摘自：https://developer.gnome.org/glib/stable/glib-Standard-Macros.html

#define G_IS_DIR_SEPARATOR(c) ((c) == G_DIR_SEPARATOR || (c) == '/')

Checks whether a character is a directory separator. It returns TRUE for '/' on UNIX machines and for '\' or '/' under Windows.

#define MIN(a, b)  (((a) < (b)) ? (a) : (b))

Calculates the minimum of a and b .

#define MAX(a, b)  (((a) > (b)) ? (a) : (b))

Calculates the maximum of a and b .

#define ABS(a)	   (((a) < 0) ? -(a) : (a))

Calculates the absolute value of a . The absolute value is simply the number with any negative sign taken away.

#define CLAMP(x, low, high)  (((x) > (high)) ? (high) : (((x) < (low)) ? (low) : (x)))

Ensures that x is between the limits set by low and high . If low is greater than high the result is undefined.

数据类型定义：[来自https://www.microchip.com/webdoc/AVRLibcReferenceManual/group__avr__stdint.html]

typedef signed char int8_t
typedef unsigned char uint8_t
typedef signed int int16_t
typedef unsigned int uint16_t
typedef signed long int int32_t
typedef unsigned long int uint32_t
typedef signed long long int int64_t
typedef unsigned long long int uint64_t