source: src/examples/sum.c@ 7528ba1

//
// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// sum.c -- 
//
// Author           : Peter A. Buhr
// Created On       : Wed May 27 17:56:53 2015
// Last Modified By : Peter A. Buhr
// Last Modified On : Fri Feb  5 16:47:44 2016
// Update Count     : 139
//

#include <fstream>

context sumable( type T ) {
        const T 0;
        T ?+?( T, T );
        T ?+=?( T *, T );
        T ++?( T * );
        T ?++( T * );
}; // sumable

forall( type T | sumable( T ) )
T sum( unsigned int n, T a[] ) {
        T total = 0;                                                                            // instantiate T, select 0
        for ( unsigned int i = 0; i < n; i += 1 )
                total += a[i];                                                                  // select +
        return total;
} // sum

// Required to satisfy sumable as char does not have addition.
// const char 0;
// char ?+?( char op1, char op2 ) { return (int)op1 + op2; } // cast forces integer addition or recursion
// char ++?( char *op ) { *op += 1; return *op; }
// char ?++( char *op ) { char temp = *op; *op += 1; return temp; }

int main( void ) {
        const int low = 5, High = 15, size = High - low;
        ofstream *sout = ofstream_stdout();
#if 0

        char s = 0, a[size];
        char v = low;
        for ( int i = 0; i < size; i += 1, v += 1 ) {
                s += v;
                a[i] = v;
        }
        sout | "sum from " | low | " to " | High | " is "
                 | (int)sum( size, a ) | ", check " | (int)s | endl;

        int s = 0, a[size];
        int v = low;
        for ( int i = 0; i < size; i += 1, v += 1 ) {
                s += (int)v;
                a[i] = (int)v;
        }
        sout | "sum from " | low | " to " | High | " is "
                 | sum( size, (int *)a ) | ", check " | (int)s | endl;

        float s = 0.0, a[size];
        float v = low / 10.0;
        for ( int i = 0; i < size; i += 1, v += 0.1f ) {
                s += (float)v;
                a[i] = (float)v;
        }
        sout | "sum from " | low / 10.0 | " to " | High / 10.0 | " is "
                 | sum( size, (float *)a ) | ", check " | (float)s | endl;
#endif
        double s = 0, a[size];
        double v = low / 10.0;

        for ( int i = 0; i < size; i += 1, v += 0.1 ) {
                s += (double)v;
                a[i] = (double)v;
        }
        sout | "sum from " | low / 10.0 | " to " | High / 10.0 | " is "
                 | sum( size, (double *)a ) | ", check " | (double)s | endl;

        // struct S { int i, j; } sarr[size];
        // struct S 0 = { 0, 0 };
        // struct S 1 = { 1, 1 };
        // S ?+?( S t1, S t2 ) { S s = { t1.i + t1.j, t2.i + t2.j }; return s; }
        // S ?+=?( S *t1, S t2 ) { *t1 = *t1 + t2; return *t1; }
        // S ++?( S *t ) { *t += 1; return *t; }
        // S ?++( S *t ) { S temp = *t; *t += 1; return temp; }
        // sum( size, sarr );
} // main

// Local Variables: //
// tab-width: 4 //
// compile-command: "cfa sum.c" //
// End: //