source: tests/references.cfa@ 152c2b2

//
// Cforall Version 1.0.0 Copyright (C) 2017 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// references.c --
//
// Author           : Rob Schluntz
// Created On       : Wed Aug 23 16:11:50 2017
// Last Modified By : Peter A. Buhr
// Last Modified On : Tue Dec 25 14:31:48 2018
// Update Count     : 11
//

#include <fstream.hfa>

struct Y { int i; };
void ?{}( Y & y ) { sout | "Default constructing a Y"; }
void ?{}( Y & y, Y other ) { sout | "Copy constructing a Y"; }
void ^?{}( Y & y ) { sout | "Destructing a Y"; }
Y ?=?( Y & y, Y other ) { sout | "Assigning a Y"; return y; }
void ?{}( Y & y, int i ) { sout | "Value constructing a Y" | i; y.i = i; }

struct X { Y & r; Y y; };
void ?{}( X & x ) {
        // ensure that r is not implicitly constructed
}
void ?{}( X & x, X other ) {
        // ensure that r is not implicitly constructed
}
void ^?{}( X & x ) {
        // ensure that r is not implicitly destructed
}
X ?=?( X & x, X other ) { return x; }

// ensure that generated functions do not implicitly operate on references
struct Z { Y & r; Y y; };

// test user-defined reference-returning function
int & toref( int * p ) { return *p; }
// test user-defined reference-parameter function
int * toptr( int & r ) { return &r; }

void changeRef( int & r ) {
        r++;
}

int main() {
        int x = 123456, x2 = 789, *p1 = &x, **p2 = &p1, ***p3 = &p2,
                &r1 = x,    &&r2 = r1,   &&&r3 = r2;
        ***p3 = 3;                                                                                      // change x
        **p3 = &x;                                                                                      // change p1
        *p3 = &p1;                                                                                      // change p2
        int y = 0, z = 11, & ar[3] = { x, y, z };                       // initialize array of references
                                                                                                                // &ar[1] = &z;                        // change reference array element
                                                                                                                // typeof( ar[1] ) p = 3;              // is int, i.e., the type of referenced object
                                                                                                                // typeof( &ar[1] ) q = &x;            // is int *, i.e., the type of pointer
        // _Static_assert( sizeof( ar[1] ) == sizeof( int ), "Array type should be int." );   // is true, i.e., the size of referenced object
        // _Static_assert( sizeof( &ar[1] ) == sizeof( int *), "Address of array should be int *." ); // is true, i.e., the size of a reference

        ((int*&)&r3) = &x;                                                                      // change r1, (&*)**r3
        x = 3;
        // test that basic reference properties are true - r1 should be an alias for x
        sout | x | r1 | &x == &r1;
        r1 = 12;
        sout | x | r1 | &x == &r1;

        // test that functions using basic references work
        sout | toref( &x ) | toref( p1 ) | toptr( r1 ) == toptr( x ) | toptr( r1 ) == &x;

        changeRef( x );
        changeRef( y );
        changeRef( z );
        sout | x | y | z;
        changeRef( r1 );
        sout | r1 | x;

        r3 = 6;                                                                                         // change x, ***r3
        sout | "x = " | x | " ; x2 = " | x2;                            // check that x was changed
        &r3 = &x2;                                                                                      // change r1 to refer to x2, (&*)**r3
        r3 = 999;                                                                                       // modify x2
        sout | "x = " | x | " ; x2 = " | x2;                            // check that x2 was changed
        ((int**&)&&r3) = p2;                                                            // change r2, (&(&*)*)*r3, ensure explicit cast to reference works
        r3 = 12345;                                                                                     // modify x
        sout | "x = " | x | " ; x2 = " | x2;                            // check that x was changed
        &&&r3 = p3;                                                                                     // change r3 to p3, (&(&(&*)*)*)r3
        ((int&)r3) = 22222;                                                                     // modify x, ensure explicit cast to reference works
        sout | "x = " | x | " ; x2 = " | x2;                                    // check that x was changed

        // test that reference members are not implicitly constructed/destructed/assigned
        X x1, x2 = x1;
        x1 = x2;

        Z z1, z2 = z1;
        Y z1r = 56, z2r = 78;
        &z1.r = &z1r;
        &z2.r = &z2r;

        z1 = z2;

        // test rvalue-to-reference conversion
        {
                struct S { double x, y; };
                void f( int & i, int & j, S & s, int v[] ) {
                        sout | i | j | "{ " | s.[x, y] | " }," | "[" | v[0] | "," | v[1] | "," | v[2] | "]";
                }
                void g(int & i) { sout | i; }
                void h(int &&& i) { sout | i; }

                int &&& r = 3;                                                                  // rvalue to reference
                int i = r;
                sout | i | r;                                                                   // both 3

                g( 3 );                                                                                 // rvalue to reference
                h( (int &&&)3 );                                                                // rvalue to reference

                int a = 5, b = 4;
                f( 3, a + b, (S){ 1.0, 7.0 }, (int [3]){ 1, 2, 3 } ); // two rvalue to reference
        }
}

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