.. _program_listing_file_SeQuant_domain_mbpt_biorthogonalization.hpp:

Program Listing for File biorthogonalization.hpp
================================================

|exhale_lsh| :ref:`Return to documentation for file <file_SeQuant_domain_mbpt_biorthogonalization.hpp>` (``SeQuant/domain/mbpt/biorthogonalization.hpp``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #ifndef SEQUANT_DOMAIN_MBPT_BIORTHOGONALIZE_HPP
   #define SEQUANT_DOMAIN_MBPT_BIORTHOGONALIZE_HPP
   
   #include <SeQuant/core/container.hpp>
   #include <SeQuant/core/expr.hpp>
   #include <SeQuant/core/index.hpp>
   
   namespace sequant {
   
   namespace {
   static constexpr double default_biorth_threshold = 1e-12;
   }
   
   [[nodiscard]] ResultExpr biorthogonal_transform_copy(
       const ResultExpr& expr, double threshold = default_biorth_threshold);
   
   [[nodiscard]] container::svector<ResultExpr> biorthogonal_transform_copy(
       const container::svector<ResultExpr>& exprs,
       double threshold = default_biorth_threshold);
   
   void biorthogonal_transform(ResultExpr& expr,
                               double threshold = default_biorth_threshold);
   
   void biorthogonal_transform(container::svector<ResultExpr>& exprs,
                               double threshold = default_biorth_threshold);
   
   [[nodiscard]] ExprPtr biorthogonal_transform(
       const ExprPtr& expr,
       const container::svector<container::svector<sequant::Index>>&
           ext_index_groups = {},
       double threshold = default_biorth_threshold);
   
   }  // namespace sequant
   
   #endif