gistfile1.cpp

#include <cstdlib>
#include <iostream>
#include <vector>
#include <string.h>

int main() {
    int *c = (int*)malloc(sizeof(*c));
    int *old_c = c;
    size_t cnt_c = 0;

    std::vector<int> v(1);
    int *old_v = &v[0];
    size_t cnt_v = 0;
    
    for (size_t i=0 ; i<1000000 ; ++i) {
        c[i] = i;
        c = (int*)realloc(c, sizeof(*c)*(100*i+2));
        if (old_c != c) {
            ++cnt_c;
        }
        old_c = c;
    }
    //for (size_t i=0 ; i<1000000*100 ; ++i) {
    //  c[i]=0;
    //} 
    //memset(c,0,sizeof(*c)*100*1000000);
        
    std::cout << "realloc() reallocations: " << cnt_c << std::endl;
    std::cout << "std::vector reallocations: " << cnt_v << std::endl;
}