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new_array.cpp
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new_array.cpp
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#include <iostream>
#include <string>
#include <memory>
#include <new>
typedef int arrT[10];
void _unique_array(int _num)
{
std::unique_ptr<int[]> up(new int [_num]());
std::cout << "Unique_ptr manage up[" <<_num <<"]" <<std::endl;
for(int idx = 0;idx != _num;idx++)
{
std::cout << up[idx] << " ";
}
std::cout << std::endl;
}
void _shared_array(int _num)
{
std::shared_ptr<int[]> sp(new int [_num](), [] (int *p){delete [] p;});
std::cout << "Shared_ptr manage sp["<<_num<<"]" << std::endl;
for (int idx = 0;idx < _num;idx++)
{
std::cout << sp[idx] << " ";
}
std::cout << std::endl;
}
int main(int argc, char *argv[])
{
int *pia = new int[10]();
std::cout << "allocate array[10] with default initialize"<< std::endl;
for (int idx = 0;idx < 10;idx++)
{
std::cout <<pia[idx] <<" ";
}
delete [] pia;
pia = nullptr;
std::cout << std::endl;
int *pa = new arrT;
std::cout << "Allocate arrT" << std::endl;
for (int idx = 0;idx != 10;idx++)
{
std::cout << pa[idx] << " ";
}
delete [] pa;
pa = nullptr;
std::cout << std::endl;
int *pia2 = new int[10]{0, 1,2,3,4,5,6,7,8,9};
std::cout << "allocate array[10] with intialazer"<<std::endl;
for (int idx = 0;idx != 10; idx++)
{
std::cout << pia2[idx]<< " ";
}
delete [] pia2;
pia2 = nullptr;
std::cout << std::endl;
std::string *psa2 = new std::string[10]();
std::cout << "allocate string[10] with default initialize" << std::endl;
for (int idx = 0;idx != 10; idx++)
{
std::cout << psa2[idx] << " ";
}
delete [] psa2;
psa2 = nullptr;
std::cout << std::endl;
int *pia3 = new int[10]{0, 1,2,3,4,5};
std::cout << "allocate array[10] with intialazer not full"<<std::endl;
for (int idx = 0;idx != 10; idx++)
{
std::cout << pia3[idx]<< " ";
}
delete [] pia3;
pia3 = nullptr;
std::cout << std::endl;
std::string *psa3 = new std::string[10] {"c++", "primer", std::string(3,'x')};
std::cout << "allocate string[10] with initializer not full" << std::endl;
for (int idx = 0;idx != 10;idx++)
{
std::cout << psa3[idx] <<" ";
}
//delete [] psa3;
psa3 = nullptr;
std::cout << std::endl;
_unique_array(12);
_shared_array(8);
return 0;
}