initalizing vectors

[Joe Laughlin]

Is there any way to initialize a vector with a bunch of values at once,
instead of doing a bunch of push_back()'s?

Thanks,
Joe

 

[Victor Bazarov]

Is there any way to initialize a vector with a bunch of values at once,
instead of doing a bunch of push_back()'s?

Yes, if you don't mind having those values in an array:

int array[] = { 1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6 };
std::vector<int> vi(array, array + (sizeof array / sizeof array[0]));

V

 

[Gianni Mariani]

Is there any way to initialize a vector with a bunch of values at once,
instead of doing a bunch of push_back()'s?

template<typename T, unsigned N>
std::vector<T> Initialize( const T (&i_v)[N] )
{
return std::vector<T>( &(i_v[0]), &(i_v[N]) );
}

int foo()
{
float a[] = { 1.2, 2.3 };

std::vector<float> v = Initialize( a );
}

- or look at :

http://www.bdsoft.com/tools/initutil.html

G

 

[Siemel Naran]

Is there any way to initialize a vector with a bunch of values at once,
instead of doing a bunch of push_back()'s?

If you want to initialize all elements to the same value:

vector<int> v(10, -1);

Other posts talk about initializing from an array, also very useful.