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1 // PR c++/71875
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2 // { dg-do link { target c++14 } }
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3
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4 template <typename T>
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5 constexpr bool IsMatrix = false;
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6
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7 template<typename TElem>
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8 class Matrix {};
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9
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10 template <typename TElem>
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11 constexpr bool IsMatrix<Matrix<TElem>> = true;
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12
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13 template<typename TNestVec>
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14 class RowVecExpMatrix;
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15
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16 template <typename TNestVec>
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17 constexpr bool IsMatrix<RowVecExpMatrix<TNestVec>> = true;
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18
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19 int
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20 main ()
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21 {
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22 static_assert (IsMatrix<RowVecExpMatrix<Matrix<int>>>, "Matrix check error");
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23 static_assert (IsMatrix<Matrix<int>>, "Input type is not a matrix");
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24 }
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