Try this out:

Note: this assumes you have a vertex shader set up to read from attribute locations 0 and 1 for vertex positions and color.

EDIT: If you wanted to strictly use GL 4.5 functions only, then you can remove the call to "glBindVertexArray" and use "glEnableVertexArrayAttrib" instead of "glEnableVertexAttribArray".

Vertex object[] =
{
	Vertex(glm::vec3(0.5f,  0.5f, 0.0f), glm::vec4(0.0f, 1.0f, 0.0f,1.0f)),
	Vertex(glm::vec3(0.5f,  -0.5f, 0.0f), glm::vec4(1.0f, 0.0f, 0.0f,1.0f)),
	Vertex(glm::vec3(-0.5f,  -0.5f, 0.0f), glm::vec4(1.0f, 0.0f, 0.0f,1.0f))
};

//Init

glCreateVertexArrays(1, &vao);
glBindVertexArray(vao);

glCreateBuffers(1, &buffer);
glNamedBufferStorage(buffer, sizeof(object), object, GL_MAP_READ_BIT); // GL_STATIC_DRAW isn't a valid param
//position
glEnableVertexAttribArray(0);
glVertexArrayAttribFormat(vao, 0, 3, GL_FLOAT, GL_FALSE, 0);
glVertexArrayAttribBinding(vao, 0, 0);

//color
glEnableVertexAttribArray(1);
glVertexArrayAttribBinding(vao, 1, 0);
glVertexArrayAttribFormat(vao, 1, 4, GL_FLOAT, GL_FALSE, sizeof(glm::vec3)); // relative offset is the size in bytes until the first "color" attribute

glVertexArrayVertexBuffer(vao, 0, buffer, 0, sizeof(Vertex)); // The stride is the number of bytes between each "Vertex"

Here's an example of using an index buffer. I'd recommend using the website docs.gl, it lets you filter out functions based on GL Version.

GLuint vao, buffer, indexBuffer;

Vertex object[] =
{
	Vertex(glm::vec3(0.5f,  0.5f, 0.0f), glm::vec4(1.0f, 0.0f, 0.0f,1.0f)),
	Vertex(glm::vec3(0.5f,  -0.5f, 0.0f), glm::vec4(0.0f, 1.0f, 0.0f,1.0f)),
	Vertex(glm::vec3(-0.5f,  -0.5f, 0.0f), glm::vec4(0.0f, 0.0f, 1.0f,1.0f)),
	Vertex(glm::vec3(-0.5f,  0.5f, 0.0f), glm::vec4(0.0f, 0.0f, 1.0f,1.0f))
};

unsigned int indices[] = { 0,1,2, 3,0,2};

//Init

glCreateVertexArrays(1, &vao);

glCreateBuffers(1, &buffer);
glNamedBufferStorage(buffer, sizeof(object), object, GL_MAP_READ_BIT); // GL_STATIC_DRAW isn't a valid param
		
//position
glEnableVertexArrayAttrib(vao, 0);
glVertexArrayAttribFormat(vao, 0, 3, GL_FLOAT, GL_FALSE, 0);
glVertexArrayAttribBinding(vao, 0, 0);

//color
glEnableVertexArrayAttrib(vao, 1);
glVertexArrayAttribFormat(vao, 1, 4, GL_FLOAT, GL_FALSE, sizeof(glm::vec3)); // relative offset is the size in bytes until the first "color" attribute
glVertexArrayAttribBinding(vao, 1, 0);

glVertexArrayVertexBuffer(vao, 0, buffer, 0, sizeof(Vertex)); // The stride is the number of bytes between each "Vertex"

// Create index buffer
glCreateBuffers(1, &indexBuffer); 
glNamedBufferStorage(indexBuffer, sizeof(indices), indices, GL_MAP_READ_BIT);
glVertexArrayElementBuffer(vao, indexBuffer);

// Draw
glBindVertexArray(vao);
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0); // Second parameter is the number of indices