golang里要实现查找数组最小数的泛型函数，需要用到类型开关。

gol的类型开关写法：

switchv.(type){
caseint:
casefloat64:
casestring:
}

思路就是遍历数组，遇到更小的数保存下来，函数退出返回那个数。

golang代码：

packagemain

import(
"fmt"
)

funcMinimum(firstinterface{},rest...interface{})interface{}{
minimum:=first

for_,v:=rangerest{
switchv.(type){
caseint:
ifv:=v.(int);v<minimum.(int){
minimum=v
}
casefloat64:
ifv:=v.(float64);v<minimum.(float64){
minimum=v
}
casestring:
ifv:=v.(string);v<minimum.(string){
minimum=v
}
}
}
returnminimum
}

funcmain(){
i:=Minimum(1,3,5,7,9,10,-1,1).(int)
fmt.Printf("i=%d\n",i)
}

clang:

#include<stdio.h>

intmin_int(void*v1,void*v2){
return*(int*)v1>*(int*)v2;
}

intmin_double(void*v1,void*v2){
return*(double*)v1>*(double*)v2;
}

void*minimum(void*base,intsize,intesize,int(*min_cmp)(void*,void*)){
inti;
void*mini=base;

for(i=1;i<size;i++){
if(min_cmp(mini,base+i*esize))
mini=base+i*esize;
}
returnmini;
}

#defineARR_LEN(arr)sizeof(arr)/sizeof((arr)[0])
#defineARR_ESIZE(arr)sizeof((arr)[0])

intmain(){
void*min;
intarr_int[]={0,6,8,2};
min=minimum(arr_int,ARR_LEN(arr_int),ARR_ESIZE(arr_int),min_int);
printf("%d\n",*(int*)min);

doublearr_double[]={1.1,2.2,3.3,4.4,5.5,6.6,-3.14,99};
min=minimum(arr_double,ARR_LEN(arr_double),ARR_ESIZE(arr_double),min_double);
printf("%lf\n",*(double*)min);
return0;
}