Compilation error with complex hybridization

[hmenke]

Prerequisites

• Please check that a similar issue isn't already filed: https://github.com/issues?q=is%3Aissue+user%3Atriqs

Description

The combination of -DHybridisation_is_complex=ON -DLocal_hamiltonian_is_complex=OFF does not compile currently, whereas -DHybridisation_is_complex=ON -DLocal_hamiltonian_is_complex=ON does compile without problems. However, I believe that compelx hybridization and complex local Hamiltonian do not imply one another, no? Hence the combination of -DHybridisation_is_complex=ON -DLocal_hamiltonian_is_complex=OFF should also be possible.

Steps to Reproduce

1. cmake -S . -B build -DHybridisation_is_complex=ON -DLocal_hamiltonian_is_complex=OFF
2. cmake --build build/

Expected behavior: No compiler error.

Actual behavior: Compilation error.

/tmp/cthyb_unstable/c++/triqs_cthyb/measures/G_tau.cpp:69:30: error: no matching conversion for functional-style cast from 'expr<'-', expr<'-', basic_array_view<complex<double>, 2, C_stride_layout, 'M', default_accessor, borrowed<nda::mem::AddressSpace::Host>>, int>, basic_array_view<complex<double>, 2, C_stride_layout, 'M', default_accessor, borrowed<nda::mem::AddressSpace::Host>>>' to 'matrix_t' (aka 'basic_array<double, 2, nda::C_layout, 'M', nda::heap_basic<nda::mem::mallocator<nda::mem::AddressSpace::Host>>>')
   69 |       G_tau_block[0] = 0.5 * matrix_t(G_tau_block[0] - 1 - G_tau_block[last]);
      |                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Versions

• TRIQS

  commit 29808cc6f8803c1e58f7526563afd61cc2df6598 (HEAD -> unstable, origin/unstable)
  Author: Harrison LaBollita <harrisonlabollita@gmail.com>
  Date:   Thu Aug 14 12:15:43 2025 -0400
  
      add optional axes argument to oplot, deprecate ax.oplot
  

• cthyb

  commit f4ff9639dac671b609f4c40f2595f1b61627f06f (HEAD -> unstable, origin/unstable)
  Author: Nils Wentzell <nwentzell@flatironinstitute.org>
  Date:   Tue Oct 14 13:46:15 2025 -0400
  
      Sort states in descending order of probability in the multiplet analysis
  

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Additional Information

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[Thoemi09]

Thanks, @hmenke! I can confirm this bug.

There is a note in the documentation (at the very bottom): https://triqs.github.io/cthyb/latest/install.html

However, I'm not sure why it is not supported or if it makes sense to support it. Maybe @Wentzell has more information.