initialising a static std::vector data member

[Dylan]

what is the best way of initializing a static std::vector data member
with some values?

(currently I just push_back some values in the constructor if the size
== 0)

thanks

 

[Rolf Magnus]

what is the best way of initializing a static std::vector data member
with some values?

By static, you mean static member? You can initialize it with an array.

#include <vector>
#include <iostream>

struct Foo
{
static std::vector<int> vec;
private:
static const int array[];
};

const int Foo::array[] = { 1, 10, 100, 1000, 10000, 42 };
std::vector<int> Foo::vec(array, array + sizeof(array)/sizeof(*array));

int main()
{
std::cout << Foo::vec.back() << '\n';
}

If your vector is also constant, you might just as well use the array
directly instead.

 

[Dylan]

thanks Rolf

what is the best way of initializing a static std::vector data member
with some values?

By static, you mean static member? You can initialize it with an array.

#include <vector>
#include <iostream>

struct Foo
{
static std::vector<int> vec;
private:
static const int array[];
};

const int Foo::array[] = { 1, 10, 100, 1000, 10000, 42 };
std::vector<int> Foo::vec(array, array + sizeof(array)/sizeof(*array));

int main()
{
std::cout << Foo::vec.back() << '\n';
}

If your vector is also constant, you might just as well use the array
directly instead.