Inline built-in function

How to write it ： It can be declared and defined in full inline You can also write only when declaring .

purpose ： Before calling this function inline The information of informs the compiling system , The compilation system will handle function calls as built-in functions . If you call many times or have requirements for call efficiency, you can declare to ask the built-in function ;

Be careful ！： The built-in function declaration only suggests the system , Not instructions .

Only simple functions with small scale and frequent calls are applicable .

Example ：

#include<iostream>
using namespace std;
inline  int max(int, int, int);
int main() {
	int a = max(5, 6, 9);
	cout << a;
	return 0;
}
int max(int a, int b, int c) {
	int maxword = a;
	if (a < b) {
		maxword = b;
	}
	if (maxword < c) {
		maxword = c;
	}
	return maxword;
}