c - 在 C 中调用函数时\是什么意思？

Question

我正在查看一些代码，发现它在调用函数时使用\来分隔行，这是否意味着什么？还是只是为了更具可读性？

        function(\
        lets_say_this_a_long_attribute, \
        and_this_is_another_attribute_with_a_long_name_or_operations, \
        attribute);

Answer 1

来自 C 标准 ( 5.1.1.2 Translation phases )

2. Each instance of a backslash character () immediately followed by a new-line character is deleted, splicing physical source lines to form logical source lines. Only the last backslash on any physical source line shall be eligible for being part of such a splice. A source file that is not empty shall end in a new-line character, which shall not be immediately preceded by a backslash character before any such splicing takes place.

例如这些物理线路

i\
n\
t\
 x;

形成逻辑线

int x;

这是一个演示程序。

#include <stdio.h>

int main(void) 
{
    i\
n\
t\
 x = 10;

    p\
r\
i\
n\
t\
f
    ( "%d\n", 
    x );

    return 0;
}

它的输出是

10

这种技术用于编写宏，例如#define。