cpp_tests/t14_vector_data.cpp at master · s-kramer/cpp_tests · GitHub

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#include <iostream>

#include <cstdlib>

#include <boost/scoped_ptr.hpp>

#include <fcntl.h>

#include <cstdio>

#include <vector>

#include <time.h>

int open_file (const char* path = "scoped_ptr_test")

{

int f = open (path, O_RDWR | O_NONBLOCK);

if (f < 0)

{

perror ("File opening went bad.\n");

}

return f;

}

int main()

{

//boost::scoped_ptr<unsigned int> p ( new unsigned int (5));

//alternative vector test

//int values_array[] = {5, 16, 55, 123, 222};

//std::vector<unsigned int> p (values_array, values_array + sizeof (values_array) / sizeof (int));

std::vector <unsigned int> p (10);

unsigned int* p_data = p.data();

auto iterator = p.begin();

for (auto& i : p)

i = rand() % 1000;

ssize_t ret = 0;

int f = open_file();

ret = write (f, &(*iterator), p.size() * sizeof (unsigned int));

p_data += ret / sizeof (unsigned int); //moves the pointer to unwritten data

if (ret < 0)

{

perror ("Write error.");

return ret;

}

else

std::cout << "Write status: " << ret << '\n';

close(f);

f = open_file();

ret = read (f, p.data(), p.size() * sizeof (unsigned int));

if (ret < 0)

{

perror ("Read error.");

return ret;

}

else

std::cout << "Read status: " << ret << '\n';

for (auto& i : p)

std::cout << i << " " << &i << '\n';

for (auto i = p.begin(); i != p.end(); ++i)

std::cout << &(*i) << " " << *i << '\n';

close(f);

return 0;

}

cpp_tests/t14_vector_data.cpp at master · s-kramer/cpp_tests · GitHub

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