CODEWITHSUNDEEP
c++initializationsimd
ulak blade
ulak blade

Reputation: 2655

Error: initialization with '{...}' is not allowed for object of type "const MyClass"

Basically I have a wrapper around a SIMD structure that goes like this:

class MyClass
{
public:
   MyClass();

   __m128 SIMD;
};

I saw that in the DirectXMath SIMD math library from Microsoft they can do things like:

const XMVECTOR SinCoefficients0    = {-0.16666667f, +0.0083333310f, -0.00019840874f, +2.7525562e-06f};

where XMVECTOR just wraps around something like this:

union
{
  float f[4];
  __m128 entry;
};

I also tried to use a union with an array, but it still gives me the same error.

Upvotes: 1

Views: 2580

Answers (1)

Jesse Good
Jesse Good

Reputation: 52365

In order to be able to use aggregate initialization, you need to remove the user-defined ctor and make sure all members are public:

struct MyClass
{
   __m128 SIMD;
};

Please read aggregate initialization which explains what an aggregate is and how the initialization works.

Upvotes: 4

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