tree 4ab0fbdd58f0b82d14c64336247987a863212acc
parent 8def196166ddd56be2e8e547d9df1c73d0ad3391
author Alex Stewart <alexs.mac@gmail.com> 1579453058 +0000
committer Alex Stewart <alexs.mac@gmail.com> 1579453058 +0000

Fix use of incomplete type in defaulted Problem methods

- As Problem contains a unique_ptr<ProblemImpl> and as defaulted
  methods are declared inline where ProblemImpl's implementation is not
  available use of '= default' will generate compile errors on strict
  compilers.
- This CL moves the definition of defaulted methods to the
  implementation.

Change-Id: I7d79757cf684378fadef8e6f4000c84387018cdb