Custom basic_string::operator new()
Posted by Anonymous on Mon 13th Jun 2022 15:57
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/*
 * Custom basic_string::operator new() - does not work yet
 *
 * $ g++ -std=gnu++11 -g std_string_custom_new1.cpp
 * std_string_custom_new1.cpp:12:7: error: ?template<class _CharT, class _Traits, class _Alloc> class std::__cxx11::basic_string? used without template arguments
 *  12 | void *basic_string::operator new(size_t size)
 *     |       ^~~~~~~~~~~~
 */

#include <iostream>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

using namespace std;

char mymemoryarena[65536];
size_t mymemoryarena_index = 0;

void *basic_string::operator new(size_t size)
{
        write(1, "#mark", 5);
        void *ptr = &mymemoryarena[mymemoryarena_index];

        mymemoryarena_index += size;

        return ptr;
}

int main(int ac, char *av[])
{
        (void)puts("#start.");

        string *x1 = new string("hello");
        string *x2 = new string("world");

        string x3 = *x1 + string(" ") + *x2;

        cout << x3 << endl;


        (void)puts("#done.");
        return EXIT_SUCCESS;
}