mirror of
https://github.com/cosmo-sims/monofonIC.git
synced 2024-09-19 17:03:45 +02:00
52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
#pragma once
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#include <general.hh>
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namespace op{
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//!== long list of primitive operators to work on fields ==!//
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template< typename field>
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inline auto assign_to( field& g ){return [&g](auto i, auto v){ g[i] = v; };}
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template< typename field, typename val >
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inline auto multiply_add_to( field& g, val x ){return [&g,x](auto i, auto v){ g[i] += v*x; };}
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template< typename field>
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inline auto add_to( field& g ){return [&g](auto i, auto v){ g[i] += v; };}
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template< typename field>
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inline auto add_twice_to( field& g ){return [&g](auto i, auto v){ g[i] += 2*v; };}
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template< typename field>
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inline auto subtract_from( field& g ){return [&g](auto i, auto v){ g[i] -= v; };}
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template< typename field>
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inline auto subtract_twice_from( field& g ){return [&g](auto i, auto v){ g[i] -= 2*v; };}
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//! vanilla standard gradient
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class fourier_gradient{
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private:
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real_t boxlen_, k0_;
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size_t n_, nhalf_;
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public:
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explicit fourier_gradient( const ConfigFile& the_config )
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: boxlen_( the_config.GetValue<double>("setup", "BoxLength") ),
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k0_(2.0*M_PI/boxlen_),
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n_( the_config.GetValue<size_t>("setup","GridRes") ),
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nhalf_( n_/2 )
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{}
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inline ccomplex_t gradient( const int idim, std::array<size_t,3> ijk ) const
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{
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real_t rgrad =
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(ijk[idim]!=nhalf_)? (real_t(ijk[idim]) - real_t(ijk[idim] > nhalf_) * n_) : 0.0;
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return ccomplex_t(0.0,rgrad * k0_);
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}
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inline real_t vfac_corr( std::array<size_t,3> ijk ) const
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{
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return 1.0;
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}
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};
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}
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