sum< expr > Struct Template Reference

It model an expression expr1 + ... exprn. More...

Detailed Description

template<typename... expr>
struct sum< expr >

It model an expression expr1 + ... exprn.

Template Parameters

expr..	two or more expression to be summed
Sys_eqs	stystem specification

Example

    // grid size
    size_t sz[2]={16,16};

    // spacing
    float spacing[2] = {0.5,0.3};

    // grid_sm
    grid_sm<2,void> ginfo(sz);

    // grid_dist_testing
    grid_dist_testing<2> g_map(sz);

    // Create several keys
    grid_dist_key_dx<2> key11(0,grid_key_dx<2>(1,1));
    grid_dist_key_dx<2> key22(0,grid_key_dx<2>(2,2));
    grid_dist_key_dx<2> key1414(0,grid_key_dx<2>(14,14));

    // filled colums
    std::unordered_map<long int,float> cols;

    sum<Field<V,sys_pp>,Field<V,sys_pp>,sys_pp>::value(g_map,key11,ginfo,spacing,cols,1);

    BOOST_REQUIRE_EQUAL(cols.size(),1ul);

    BOOST_REQUIRE_EQUAL(cols[17],2);

Definition at line 92 of file sum.hpp.

#include <sum.hpp>

Public Types
typedef boost::mpl::vector < expr... >	v_expr
	Transform from variadic template to boost mpl vector.
typedef boost::mpl::size < v_expr >::type	v_sz
	size of v_expr
typedef boost::mpl::at< v_expr, boost::mpl::int_ < v_sz::type::value-1 > >::type	Sys_eqs
	struct that specify the syste, of equations

Static Public Member Functions
static void	value (const typename stub_or_real< Sys_eqs, Sys_eqs::dims, typename Sys_eqs::stype, typename Sys_eqs::b_grid::decomposition::extended_type >::type &g_map, grid_dist_key_dx< Sys_eqs::dims > &kmap, const grid_sm< Sys_eqs::dims, void > &gs, typename Sys_eqs::stype(&spacing)[Sys_eqs::dims], std::unordered_map< long int, typename Sys_eqs::stype > &cols, typename Sys_eqs::stype coeff)
	Calculate which colums of the Matrix are non zero. More...

Member Function Documentation

template<typename... expr>

static void sum< expr >::value ( const typename stub_or_real< Sys_eqs, Sys_eqs::dims, typename Sys_eqs::stype, typename Sys_eqs::b_grid::decomposition::extended_type >::type &  g_map, grid_dist_key_dx< Sys_eqs::dims > &  kmap, const grid_sm< Sys_eqs::dims, void > &  gs, typename Sys_eqs::stype(&)  spacing[Sys_eqs::dims], std::unordered_map< long int, typename Sys_eqs::stype > &  cols, typename Sys_eqs::stype  coeff  )

inlinestatic

Calculate which colums of the Matrix are non zero.

Parameters

g_map	Grid mapping, it convert grid position into vector/Matrix row
kmap	grid position
gs	grid information
spacing	grid spacing
cols	unordered map contain the map colum -> value
coeff	it contain an additional actual coefficients in front of the values

Example

    // grid size
    size_t sz[2]={16,16};

    // spacing
    float spacing[2] = {0.5,0.3};

    // grid_sm
    grid_sm<2,void> ginfo(sz);

    // grid_dist_testing
    grid_dist_testing<2> g_map(sz);

    // Create several keys
    grid_dist_key_dx<2> key11(0,grid_key_dx<2>(1,1));
    grid_dist_key_dx<2> key22(0,grid_key_dx<2>(2,2));
    grid_dist_key_dx<2> key1414(0,grid_key_dx<2>(14,14));

    // filled colums
    std::unordered_map<long int,float> cols;

    sum<Field<V,sys_pp>,Field<V,sys_pp>,sys_pp>::value(g_map,key11,ginfo,spacing,cols,1);

    BOOST_REQUIRE_EQUAL(cols.size(),1ul);

    BOOST_REQUIRE_EQUAL(cols[17],2);

Definition at line 117 of file sum.hpp.

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The documentation for this struct was generated from the following file:

• openfpm_numerics/src/FiniteDifference/sum.hpp