Broken backward compability: libBoost 1.66 -> libBoost 1.67
Nobody has claimed this yet.
Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 35/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Stale
- Tech stack
- cpp
- Domain
- backend-api-design
Research direction
Start with the minimal Boost.Optional example in the issue and compare constructor overload resolution between libBoost 1.66 and 1.67. Read the optional constructor implementation and existing compatibility tests, if present; done means the example has consistent intended behavior across the affected versions and the regression is covered by a test.
Written by the indexing model from the issue text.
Description
Problematic code:
#include <boost/optional/optional.hpp>
struct A
{
A(int a) : a(a) {}
int a;
};
#define TRUE 1
int main()
{
return boost::optional<A>(TRUE , 5)->a;
}
libBoost 1.66 calls here:
optional ( bool cond, rval_reference_type val )
boost::optional(1, A(5));
and returns 5,
libBoost 1.67 and newer calls here:
template
explicit optional ( Expr&& expr,
BOOST_DEDUCED_TYPENAME boost::enable_if< optional_detail::is_optional_val_init_candidate<T, Expr>, bool>::type = true
)
and returns 1.
This is change of behavior without any warring.
- Dominant language
- C++
- Stars
- 60
- Forks
- 75
- PR merge metrics
- No merged PRs in 30d
Contributor guide
No contributing guide indexed for this repository
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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