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Gecode / gecode

Generic Constraint Development Environment
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Replace using statement with typedef to fix Windows Gist compilation #133

Closed cyderize closed 2 years ago

cyderize commented 2 years ago

The using statement causes Gecode Gist compilation to fail on Windows with VS2019 and Qt 6.2.1:

gecode/kernel/branch/val-sel.hpp(118): error C2244: 'Gecode::ValSelFunction<View>::ValSelFunction': unable to match function definition to an existing declaration
gecode/kernel/branch/val-sel.hpp(116): note: see declaration of 'Gecode::ValSelFunction<View>::ValSelFunction'
gecode/kernel/branch/val-sel.hpp(118): note: definition
gecode/kernel/branch/val-sel.hpp(118): note: 'Gecode::ValSelFunction<View>::ValSelFunction(Gecode::Space &,const Gecode::ValBranch<Gecode::Var> &)'
gecode/kernel/branch/val-sel.hpp(118): note: existing declarations
gecode/kernel/branch/val-sel.hpp(118): note: 'Gecode::ValSelFunction<View>::ValSelFunction(Gecode::Space &,Gecode::ValSelFunction<View> &)'
gecode/kernel/branch/val-sel.hpp(118): note: 'Gecode::ValSelFunction<View>::ValSelFunction(Gecode::Space &,const Gecode::ValBranch<ValSelFunction<View>::ValSel<View,BranchTraits<View::VarType>::ValType>::Var> &)'

This seems like it may be a bug in MSVC, which resolves Var to Gecode::Var in the constructor for ValSelFunction instead of Gecode::ValSelFunction<View>::Var.

It also does not happen with Qt 5.12.9, or without Gist, although I don't see how changing the Qt version could cause this problem.