CODEWITHSUNDEEP
c++
SwiftMango
SwiftMango

Reputation: 15294

POD type initialization using initialization list does not work

I have defined a POD type as below:

template<typename kernelEntryT, size_t kernelRowSize, size_t kernelColSize>
class ImageProcessing::Kernel {
    kernelEntryT kernelMatrix[kernelRowSize][kernelColSize];
};

int main(){
    ImageProcessing::Kernel<int,3,3> k = {{0,0,0},{0,1,0},{0,0,0}};
}

It does not compile, and tell me:

error: could not convert ‘{{0, 0, 0}, {0, 1, 0}, {0, 0, 0}}’ from ‘<brace-enclosed initializer list>’ to ‘ImageProcessing::Kernel<int, 3ul, 3ul>’
     ImageProcessing::Kernel<int,3,3> k = {{0,0,0},{0,1,0},{0,0,0}};

Edit: Test Code

Upvotes: 0

Views: 182

Answers (1)

juanchopanza
juanchopanza

Reputation: 227438

You have a missing set of braces (the data member is a single array) and you need to make the data member public, because an aggregate cannot have private or protected members.

This is a simplified, working example:

#include <cstddef> // for std::size_t

template<typename T, std::size_t N, std::size_t M>
class Kernel {
 public:
    T kernelMatrix[N][M];
};

int main(){
    Kernel<int,3,3> k = { {{0,0,0}, {0,1,0}, {0,0,0}} };
}

Upvotes: 2

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