tmp/tmpaunvmznk/{from.md → to.md}
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| 1 |
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#### Preconditions <a id="linalg.helpers.precond">[[linalg.helpers.precond]]</a>
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[*Note 1*: These exposition-only helper functions use the less
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constraining input concepts even for the output arguments, because the
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additional constraint for assignability of elements is not necessary,
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and they are sometimes used in a context where the third argument is an
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input type too. — *end note*]
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``` cpp
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constexpr bool addable( // exposition only
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const in-vector auto& in1, const in-vector auto& in2, const in-vector auto& out) {
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return out.extent(0) == in1.extent(0) && out.extent(0) == in2.extent(0);
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}
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constexpr bool addable( // exposition only
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const in-matrix auto& in1, const in-matrix auto& in2, const in-matrix auto& out) {
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return out.extent(0) == in1.extent(0) && out.extent(1) == in1.extent(1) &&
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out.extent(0) == in2.extent(0) && out.extent(1) == in2.extent(1);
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}
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constexpr bool multipliable( // exposition only
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const in-matrix auto& in_mat, const in-vector auto& in_vec, const in-vector auto& out_vec) {
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return out_vec.extent(0) == in_mat.extent(0) && in_mat.extent(1) == in_vec.extent(0);
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}
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constexpr bool multipliable( // exposition only
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const in-vector auto& in_vec, const in-matrix auto& in_mat, const in-vector auto& out_vec) {
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return out_vec.extent(0) == in_mat.extent(1) && in_mat.extent(0) == in_vec.extent(0);
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}
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constexpr bool multipliable( // exposition only
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const in-matrix auto& in_mat1, const in-matrix auto& in_mat2, const in-matrix auto& out_mat) {
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return out_mat.extent(0) == in_mat1.extent(0) && out_mat.extent(1) == in_mat2.extent(1) &&
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in_mat1.extent(1) == in_mat2.extent(0);
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}
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```
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