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Question

我得到了一個循環分配的一些內存 - 如何釋放它，當我與tr_data變量做了什麼？ （我是相當新的C++）

#define Malloc(type,n) (type *)malloc((n)*sizeof(type)) 

    struct svm_problem tr_data; 
    tr_data.l = (int) prm_num_samples_anchored.array[bar]; 

    tr_data.y = Malloc(double, tr_data.l); 
    tr_data.x = Malloc(struct svm_node*, tr_data.l); 



    for (int row = 0; row < tr_data.l; row++) 
    { 
     tr_data.y[row] = ta0.array[bar-row-1]; 

     //leak 
     svm_node* tr_data_x_onerow = Malloc(svm_node, num_features+1); 

     tr_data_x_onerow[0].index = 1; tr_data_x_onerow[0].value = in0.array[bar-row-1]; tr_data_x_onerow[1].index = 2; tr_data_x_onerow[1].value = in1.array[bar-row-1]; tr_data_x_onerow[2].index = 3; tr_data_x_onerow[2].value = in2.array[bar-row-1]; tr_data_x_onerow[3].index = 4; tr_data_x_onerow[3].value = in3.array[bar-row-1]; tr_data_x_onerow[4].index = 5; tr_data_x_onerow[4].value = in4.array[bar-row-1]; tr_data_x_onerow[5].index = 6; tr_data_x_onerow[5].value = in5.array[bar-row-1]; tr_data_x_onerow[6].index = 7; tr_data_x_onerow[6].value = in6.array[bar-row-1]; tr_data_x_onerow[7].index = 8; tr_data_x_onerow[7].value = in7.array[bar-row-1]; tr_data_x_onerow[8].index = 9; tr_data_x_onerow[8].value = in8.array[bar-row-1]; tr_data_x_onerow[9].index = 10; 

     tr_data_x_onerow[num_features].index = -1;  //Each row of properties should be terminated with a -1 according to the readme 

     tr_data.x[row] = tr_data_x_onerow; 

    } 

...上tr_data 幾個操作...這不起作用

for (int row = 0; row <tr_data.l; row++) 
    { 
     free(tr_data_x_onerow); 
    } 

Answer 1

for (int row = 0; row <tr_data.l; row++) 
{ 
    free(tr_data.x[row]); 
} 

但請，乾脆不要做這個。這是C++。使用矢量或其他理智的收藏。