可能设置指针的所有元素在malloc后浮动

Question

有没有办法在C中执行以下操作？

float *t = (float*)malloc(t_size*sizeof(float)); 
t = { 
    1,0,0, 
-1,0,0, 
    0,1,0 
}; 

如何以下类似的是标准的

float t[9] = { 
1,0,0, 
-1,0,0, 
0,1,0 
}; 

Answer 1

至于问，一个c soultion可以使用compound literals

#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 

int main() 
{ 
    #define t_size 9 
    float *t = malloc(t_size*sizeof(*t)); 

    if (t != NULL) 
    { 
     memcpy(t, (float[t_size]){1,0,0,-1,0,0,0,1,0}, t_size*sizeof(*t)); 

     for (size_t i=0; i<t_size; i++) 
      printf("t[%zu] = %g\n", i, t[i]); 
    } 

    free(t); 

    return 0; 
}