d不需要分配

struct Vec(E, size_t n) {
    E[n] impl;
    alias impl this;

    E[n] opBinary(string op)(Vec v) {
        Vec result;
        mixin("result.impl[] = impl[] "~op~" v.impl[];");
        return result;
    }
}
auto v(Args...)(Args args) {
    import std.traits : CommonType;
    alias E = CommonType!Args;
    Vec!(E, Args.length) result;
    result.impl = [ args ];
    return result;
}
extern(C) void main() @nogc {
    // Look, ma! No allocations!
    int[3] arr = v(1,2,3) + v(4,5,6);
    assert(arr[0] == 5 && arr[1] == 7 && arr[2] == 9);
}