char a = '@';
char *ap = &a;
void *vpa = ≈
char *bp = *((char**)vpa);
char b = *bp;

char a = '@';
char *ap = &a;
void *vpa = ≈
// так
char *bp = *reinterpret_cast< char** >( vpa );
char b = *bp;

#include <iostream>
#include <cstring>
#include <vector>
#include <algorithm>

int main(int argc, char *argv[]) 
{
	std::vector<const char*> arr = { "red", "green", "blue", "apple-green", "orange", "violett" };

	std::sort( arr.begin(), arr.end(), 
		[](const char *a, const char *b) 
                {
			return std::strcmp(a, b) < 0;
		}
	);

	for( auto p: arr ) 
            std::cout << p << ' ';
	std::cout << "\n";
	return 0;
}

#include <iostream>
#include <cstring>
#include <vector>
#include <algorithm>
#include <cstdlib>

int main(int argc, char *argv[]) 
{
	std::vector<const char*> arr = { "red", "green", "blue" };

    // void qsort( void *ptr, std::size_t count, std::size_t size, /*compare-pred*/* comp );
	std::qsort( arr.data(), arr.size(), sizeof(arr[0]),
		[](const void *a, const void *b) -> int
        {
            using cstring_t = const char*;
            using p_cstring_t = const cstring_t*;
            const char* as = *reinterpret_cast< p_cstring_t >(a);
            const char* bs = *reinterpret_cast< p_cstring_t >(b);
			return std::strcmp(as, bs);
		}
	);

	for( auto p: arr ) 
            std::cout << p << ' ';
	std::cout << "\n";
	return 0;
}

	std::sort( arr.begin(), arr.end(), 
		[](const char *a, const char *b) 
                {
			return std::strcmp(a, b);
		}
	);