Can I assign safely an array to vector?

[Ram Laxman]

Hi all,
Can I assign an array to a vector if both(array and vector)
holds same data type?

 

[Jeff Schwab]

Hi all,
Can I assign an array to a vector if both(array and vector)
holds same data type?

Yes, but maybe not using the syntax you expect.


#include <vector>

int main( )
{
std::vector<int> vector;
int array[ ] = { 1, 2, 3 };

vector.assign( array, array + 3 );
}

 

[Thomas Tutone]

Hi all,
Can I assign an array to a vector if both(array and vector)
holds same data type?

Yes, but maybe not using the syntax you expect.


#include <vector>

int main( )
{
std::vector<int> vector;
int array[ ] = { 1, 2, 3 };

vector.assign( array, array + 3 );
}

Or just:

#include <vector>

int main()
{
int array[] = { 1, 2, 3 };
std::vector<int> vec(array, array + sizeof(array));
}

Best regards,

Tom

 

[Kevin Goodsell]

Or just:

#include <vector>

int main()
{
int array[] = { 1, 2, 3 };
std::vector<int> vec(array, array + sizeof(array));

This will probably not work correctly. You wanted the number of elements
in the array, not the number of bytes used to store the array.

int array[] = { 1, 2, 3 };
int size = sizeof array / sizeof *array;
std::vector<int> vec(array, array + size);

-Kevin

 

[Jeff Schwab]

Hi all,
Can I assign an array to a vector if both(array and vector)
holds same data type?

Yes, but maybe not using the syntax you expect.


#include <vector>

int main( )
{
std::vector<int> vector;
int array[ ] = { 1, 2, 3 };

vector.assign( array, array + 3 );
}

Or just:

#include <vector>

int main()
{
int array[] = { 1, 2, 3 };
std::vector<int> vec(array, array + sizeof(array));
}

That's not assignment, it's initialization.

 

[Thomas Tutone]

#include <vector>

int main()
{
int array[] = { 1, 2, 3 };
std::vector<int> vec(array, array + sizeof(array));

This will probably not work correctly. You wanted the number of elements
in the array, not the number of bytes used to store the array.

Oops. Absolutely right.

Best regards,

Tom