combine c++ string with dynamically allocated c array of chars through overloaded add operator, C++ (gcc)

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//Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x64 [v]
//clang 3.8.0 [v]
//g++  5.4.0 [v]
//combine c++ string with dynamically allocated c array of chars through overloaded add operator

// C++ headers
#include <iostream> 
#include <string>
// C headers
#include <stdlib.h>
#include <string.h>

/** test function simulating data read 
 * (fills the buffer "*pdata" with something
 * and the buffer "*dataSize" with its size
 */
void getData(char** pdata, int* dataSize);

/** simply releases the data get with "getData()" */
void freeData(char** pdata);

int main()
{
    
    std::string s("my text is: "); // C++ std::string
    std::string t; // result
    char* data; // array of chars
    int siz; // the size of the array of chars
    // 
    getData(&data, &siz);
    t = s + "\"" + data + "\"";
    std::cout<<t<<std::endl; // print result
    freeData(&data); // free resource(s)
    
    // 
    return 0;
    
}

void getData(char** pdata, int* dataSize)
{
    const char sz[] = "the quick brown fox";
    *dataSize = strlen(sz);
    *pdata = (char*)malloc(*dataSize);
    memset(*pdata, 0, *dataSize);
    memcpy(*pdata, sz, *dataSize);
    
}

void freeData(char** pdata)
{
    free(*pdata);
}

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Compilation time: 0.43 sec, absolute running time: 0.1 sec, cpu time: 0.04 sec, memory peak: 3 Mb, absolute service time: 0,54 sec

combine c++ string with dynamically allocated c array of chars through...