VertexArray declaration inside a class - c++

Question

I'm trying to create a struct containing a point primitive and a method to draw it. However, declaration of a sf::VertexArray outside of method doesn't seem to work. The exactly same declaration inside a method works perfectly fine. Here are the code samples and the error. SFML version 2.1
edit: in both cases using namespace std; is used.
Works:
struct Point
{
int dot_x, dot_y;
sf::Color dot_color;
Point (int x = 50, int y = 50, sf::Color color = sf::Color::Green) {
dot_color = color;
dot_x = x;
dot_y = y;
}
virtual void draw() {
sf::VertexArray dot(sf::Points, 1);
dot[0].position = sf::Vector2f(dot_x,dot_y);
dot[0].color = dot_color;
window.draw(dot);
}
};
Does not work:
struct Point {
sf::VertexArray dot(sf::Points, 1);
Point (int x = 50, int y = 50, sf::Color color = sf::Color::Green) {
dot[0].position = sf::Vector2f(x,y);
dot[0].color = color;
}
virtual void draw() {
window.draw(dot);
}
};
Errors (all pointing at the VertexArray declaration string):
E:\CodeBlocks\Labs\sem3\sfml1\main.cpp|64|error: 'sf::Points' is not a type|
E:\CodeBlocks\Labs\sem3\sfml1\main.cpp|64|error: expected identifier before numeric constant|
E:\CodeBlocks\Labs\sem3\sfml1\main.cpp|64|error: expected ',' or '...' before numeric constant|

Answer 1

sf::VertexArray dot(sf::Points, 1);
This is a declaration of a variable with an initialiser: you can only write those at namespace or function scope. The parser is suitably confused, as you have it in your class scope. It's basically trying to parse it as a function declaration but, since neither sf::Points nor 1 are types, this approach ultimately fails also.
You should use the constructor's member initialiser list here:
struct Point
{
sf::VertexArray dot;
Point (int x = 50, int y = 50, sf::Color color = sf::Color::Green)
: dot(sf::Points, 1)
{
dot[0].position = sf::Vector2f(x,y);
dot[0].color = color;
}
virtual void draw()
{
window.draw(dot);
}
};