Direct all std::vector assigns through size-aware version #3352
Direct all std::vector assigns through size-aware version #3352
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| // If we've made it this far, we need x to have elements to assign to, | ||
| // and we know this is either a no-op or x has size 0 | ||
| x.resize(y.size()); | ||
| if constexpr (std::is_rvalue_reference_v<U&&>) { |
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If we are trying to fix the case of the below does this do what we intend?
parameters {
array[1] vector[1] theta;
}
transformed parameters {
array[1] vector[2] wrong_size;
wrong_size = theta;
}
idt we want to resize wrong_size here. Shouldn't this throw an error?
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The first part of this function checks the sizes match if x is not size 0, and will throw an exception.
So, when this line executes it is guaranteed that x.size == y.size OR x.size == 0. If the sizes match, this resize does nothing.
But if x was size 0, and we can’t just directly assign to it, we need to resize it or else x[i] will blow up in the following loop
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In particular, this is the test I added, and the test still asserts that this throws an error, it just no longer crashes.
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Submission Checklist
./runTests.py src/test/unitmake cpplintSummary
Closes #3351
Intended Effect
More size mismatch errors are properly caught by Stan
How to Verify
New test added, which crashes on
developand passes on this branch.Side Effects
Documentation
Copyright and Licensing
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Simons Foundation
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