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  1.  
  2. #include <iostream>
  3. #include <string.h>
  4. using namespace std;
  5. char* strcat_m(const char *str_dest,const char *str_src) {
  6.    static char *new_str = nullptr;
  7.    if (new_str){
  8.       printf("~~del: %d \n",size_t(new_str));
  9.       delete[] new_str;
  10.    }
  11.  
  12.    new_str= new char[strlen(str_dest)+strlen(str_src)+1];
  13.    printf("~~new: %d \n",size_t(new_str));
  14.    strcpy(new_str,"");
  15.    strcat(new_str,str_dest);
  16.    strcat(new_str,str_src);
  17.    return new_str;
  18. };
  19.  
  20. int main()
  21. {
  22.    printf(strcat_m("123","  213123\n"));
  23.    printf(strcat_m("A  ","  B\n"));
  24.    const char* rew=strcat_m("asd"," asd\n");
  25.    //Но если написать delete[] rew, то программа вылетает при следующем вызове strcat_m
  26.    rew=strcat_m("+++ ","--- \n");
  27.    printf(rew);
  28. }
  29.  
Success #stdin #stdout 0s 15232KB
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stdin
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Standard input is empty
stdout
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~~new: 28822560 
123  213123
~~del: 28822560 
~~new: 28822560 
A    B
~~del: 28822560 
~~new: 28822560 
~~del: 28822560 
~~new: 28822560 
+++ ---
https://ideone.com/Goq7nh
language:
C++14 (clang 8.0)
created:
5 years ago
visibility:
public

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