How to initialize a variable with {}, so a member variable in it with constructor without initialization is set to zero?

Question

My question is: Since the initialization with {} is very popular today, and how to fix the struct (vec2) so the member 'v' is set to 0?
The reason I'm talking about DirectX HLSL and Vulkan GLSL is when I want to build a shader or a compute shader, then I always first make a "C++ visualization draft" by using vec2, vec3, etc., and when the draft is perfect, I transfer my code into HLSL / GLSL.

struct vec2 {
    float x, y;
    vec2() { } // If I comment this line then an error C2512 'vec2': no appropriate default constructor available.
    //vec2() : x(0), y(0) { } // I don't like this style because in DirectX HLSL and Vulkan GLSL codes, vec2 or float2 is not initialized with 0.
    vec2(float _x, float _y) : x(_x), y(_y) {}
};

struct MyStruct {
    int a;
    int b;
    int c;
    vec2 v;
};

int main() {
    // The modern and simple initialization style but we must be careful if there's a vec2.
    MyStruct s = {}; // It sets a, b, c to 0, but v is not set to { 0 0 }.
    return 0;
}

Answer 1

Try using:
vec2() = default;

Answer 2

Thanks, I didn't believe it has a solution then I spent hour before your answer to make a very complex solution (make an additional struct vec2_initializable with an operator=), but your answer is very simple and very powerful compared to mine.

Thanks.