source: tests/array-container/array-basic.cfa@ 2b910f9

#include <containers/array.hfa>

//
// Type-theory demo (success is "it compiles")
//

forall( [Nx], [Ny], [Nz] )
void typesTest( tag(Nx), tag(Ny), tag(Nz) ) {

    array( float, Nx, Ny, Nz )  xyz;

    // numeric subscripts
    ptrdiff_t ix = 1, iy = 2, iz = 3;
    array( float, Ny, Nz ) & yz = xyz[ix];
    array( float, Nz ) & z = xyz[ix][iy];
    float & val = xyz[ix][iy][iz];

    // deferral subscript
    typeof( xyz[all] ) yzx = xyz[all];

    // longform check that -[all] gives intended type (user doesn't write this)
    arpk( Ny
        , array( float, Nz)
        , arpk( Nz
              , float
              , arpk( Nx
                    , array( float, Ny, Nz )
                    , float
                    , float
                    )
              , float
              )
        , float
        )
        & yzx_long = xyz[all];
    & yzx_long = & yzx;
    & yzx  = & yzx_long;
}

//
// Runtime demo
//

#include <assert.h>

float getMagicNumber( ptrdiff_t w, ptrdiff_t x, ptrdiff_t y, ptrdiff_t z ) {

    assert( 0 <= w && w < 3 );
    assert( 0 <= x && x < 4 );
    assert( 0 <= y && y < 5 );
    assert( 0 <= z && z < 6 );

    float ww = (2.0f \ w) / 1.0f;
    float xx = (2.0f \ x) / 100.0f;
    float yy = (2.0f \ y) / 10000.0f;
    float Nz = (2.0f \ z) / 1000000.0f;

    return ww+xx+yy+Nz;
}

forall( [Nw], [Nx], [Ny], [Nz] )
void fillHelloData( array( float, Nw, Nx, Ny, Nz ) & wxyz ) {
    for (w; Nw)
    for (x; Nx)
    for (y; Ny)
    for (z; Nz)
        wxyz[w][x][y][z] = getMagicNumber(w, x, y, z);
}

forall( [N]
      , S & | sized(S)
      )
float total1d_low( arpk(N, S, float, float ) & a ) {
    float total = 0.0f;
    for (i; N)
        total += a[i];
    return total;
}

forall( A & | ar(A, float) )
float total1d_hi( A & a ) {
    float total = 0.0f;
    for (i; a`len)
        total += a[i];
    return total;
}

forall( [Nw], [Nx], [Ny], [Nz] )
void runtimeTest( tag(Nw), tag(Nx), tag(Ny), tag(Nz) ) {

    array( float, Nw, Nx, Ny, Nz ) wxyz;
    fillHelloData(wxyz);

    float expect, result;
    ptrdiff_t slice_ix = 1;

    // summing across W, with x=y=z=1

    expect = 0;
    for (i; Nw)
        expect += getMagicNumber( i, slice_ix, slice_ix, slice_ix );
    printf("expect Ws             = %f\n", expect);

    result = total1d_low( wxyz[all][slice_ix][slice_ix][slice_ix] );
    printf("result Ws [][][][] lo = %f\n", result);

    result = total1d_low( wxyz[[all, slice_ix, slice_ix, slice_ix]] );
    printf("result Ws [,,,]    lo = %f\n", result);

    result = total1d_hi( wxyz[all][slice_ix][slice_ix][slice_ix] );
    printf("result Ws [][][][] hi = %f\n", result);

    result = total1d_hi( wxyz[[all, slice_ix, slice_ix, slice_ix]] );
    printf("result Ws [,,,]    hi = %f\n", result);

    // summing across X, with w=y=z=1

    expect = 0;
    for (i; Nx)
        expect += getMagicNumber( slice_ix, i, slice_ix, slice_ix );
    printf("expect Xs             = %f\n", expect);

    result = total1d_low( wxyz[slice_ix][all][slice_ix][slice_ix] );    
    printf("result Xs [][][][] lo = %f\n", result);

    result = total1d_low( wxyz[[slice_ix, all, slice_ix, slice_ix]] );
    printf("result Xs [,,,]    lo = %f\n", result);

    result = total1d_hi( wxyz[slice_ix][all][slice_ix][slice_ix] );    
    printf("result Xs [][][][] hi = %f\n", result);

    result = total1d_hi( wxyz[[slice_ix, all, slice_ix, slice_ix]] );
    printf("result Xs [,,,]    hi = %f\n", result);

}

const size_t  KW = 3,  KX = 4,  KY = 5,  KZ = 6;

int main() {

    typesTest  (           ztag(KX), ztag(KY), ztag(KZ) );
    runtimeTest( ztag(KW), ztag(KX), ztag(KY), ztag(KZ) );
}