哪种方法最好在C中将数组作为函数参数传递? [英] Which way is better to pass arrays as function arguments in C?

问题描述

有3种方法可以将数组作为函数参数传递.

There are 3 ways to pass arrays as function arguments.

• 作为指针的形式参数，例如 void myFunction(int * param){}
• 形式参数为大小数组，例如， void myFunction(int param [10]){}
• 形式参数为无尺寸数组，例如， void myFunction(int param []){}

• Formal parameters as a pointer, e.g., void myFunction(int *param) {}
• Formal parameters as a sized array, e.g., void myFunction(int param[10]) {}
• Formal parameters as an unsized array, e.g., void myFunction(int param[]) {}

哪种方式在效率和可读性方面更好?

Which way is better in terms of efficiency and readability?

推荐答案

哪种方法最好在C中将数组作为函数参数传递?

Which way is better to pass arrays as function arguments in C?

我要使用 4号门.接收功能需要知道大小.

I am going for Door #4. The receiving function needs to know the size.

void myFunction(size_t array_element_count, int *param);

或者，代码可以使用终止标记，但是没有特殊的"I-am-not-an-int"值.

Alternatively code could use a terminating sentinel, but there are no special "I-am-not-an-int" values.

就以下而言，它们发出相同的代码.这是一个样式问题.因此，请遵循小组的风格指南.对我来说，我更喜欢 size_t array_element_count和int param [array_element_count] 作为代码意图的最有用信息.

In terms of the below, they emit the same code. This is a style issue. As such, follow the group's style guide. For me I favor size_t array_element_count, int param[array_element_count] as most informative to code's intent.

void myFunction(size_t array_element_count, int *param);
void myFunction(size_t array_element_count, int param[array_element_count]);
void myFunction(size_t array_element_count, int param[]);

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在样式上， f(size，ptr)与 f(ptr，size)大小，ptr).具有更复杂的阵列和VLA支持的IAC，以下内容很有用:

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In terms of style, f(size, ptr) vs f(ptr, size), I recall reading on the next C rev promoting f(size, ptr). IAC, with more complex arrays and VLA support , the below is useful:

foo(size_t row, size_t col, matrix[row][col]);

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