HAVE_CERES being defined might throw errors for the NonlinearLeastSquaresOptimizer

[greenleaf641]

For context this is also related with #39, meaning that the code is edited somewhat but I still believe it is relevant. When building on OSX I get some errors for the included ceres version:

jet.h:1283:25: warning: 'float_denorm_style' is deprecated [-Wdeprecated-declarations]
       >  1283 |   static constexpr std::float_denorm_style has_denorm =

If HAVE_CERED is defined though, the optimizer.hpp file has some issues when it comes to the NonlinearLeastSquaresOptimizer.
First of all:

optimizer.hpp:206:8: error: explicit specialization of undeclared template struct 'NonlinearLeastSquaresOptimizer'
       >   206 | struct NonlinearLeastSquaresOptimizer<T, OptimizerType::Ceres> final : public OptimizerBase {
       >       |        ^                             ~~~~~~~~~~~~~~~~~~~~~~~~~

and also:

optimizer.hpp:223:31: error: use of undeclared identifier 'DTable'
       >   223 |     Operon::CostFunction<DTable, Eigen::RowMajor> cf(individual, ds, target, range, dt);
       >       |                               ^

It could be because this function is not used anywhere from what I see.

[greenleaf641]

Additionally, while trying to somehow merge the IT method with Operon I now suddenly can't build because

scn/impl.cpp:729:41: error: 'scientific' is not a member of 'fast_float'
       >   729 |             format_flags |= fast_float::scientific;
       >       |                                         ^~~~~~~~~~

I've tried nix build --update-input nixpkgs but I can only build if I manually copy paste the flake.lock file from the main branch, which doesn't make much sense with my current understanding, and I don't recall ever changing anything on scn!
I did run nix flake update --commit-lock-file at some point though trying to fix the issue.

This is not related with the above, not sure if I should move it to a different issue

[foolnotion]

Additionally, while trying to somehow merge the IT method with Operon I now suddenly can't build because

scn/impl.cpp:729:41: error: 'scientific' is not a member of 'fast_float'
       >   729 |             format_flags |= fast_float::scientific;
       >       |                                         ^~~~~~~~~~

I've tried nix build --update-input nixpkgs but I can only build if I manually copy paste the flake.lock file from the main branch, which doesn't make much sense with my current understanding, and I don't recall ever changing anything on scn! I did run nix flake update --commit-lock-file at some point though trying to fix the issue.

This is not related with the above, not sure if I should move it to a different issue

Your second issue is an incompatibility between scnlib and the lastest fast-float: eliaskosunen/scnlib#135

If you're using nix, I have temporarily forced fast-float to version 6.1.6.

[greenleaf641]

I see.
So in fact me running nix flake update --commit-lock-file is what caused the issue then. Got it.