Use input as number for vector of structs?
<p>I have a <code>vertex</code> struct that stores the location of a vertex in a 2d plane and can transform its position and also used to generate vertices to make a geometric shape. i need the parameter of one of the function calls to determine how many of this struct i will need i tried using an array but that didn't work since array's only accept const variables and i tried vectors but when i generate the buffers for the vertices i can't use a vector as "There is no conversion from vector to const void" here's the function.</p>

<pre><code>void Sprite::init(Type mode, int verticesNum, float scale) {
    //generate buffer if it hasn't been generated
    if (_vboID == 0) {
        glGenBuffers(1, &amp;_vboID);
    }
    //make vector of structs using verticesNum as how many vertices are needed
    std::vector&lt;Vertex&gt; vertexData(verticesNum);

    if (mode == Type::CIRCLE) {
        for (int i = verticesNum; i &lt; verticesNum; i++) {
            float angle = (M_PI / 180) * i;
            vertexData[i].setPosition(cos(angle)*scale, sin(angle)*scale);
        }
    }

    //Tell opengl to bind our vertex buffer object
    glBindBuffer(GL_ARRAY_BUFFER, _vboID);
    //Upload the data to the GPU
    //this line is where i get the error as it can't use vertex data
    glBufferData(GL_ARRAY_BUFFER, sizeof(vertexData), /*right here*/vertexData/*to be more specific*/, GL_STATIC_DRAW);

    //Unbind the buffer
    glBindBuffer(GL_ARRAY_BUFFER, 0);
}
</code></pre>