function test_transfers

test_mult_inherit;
test_scopes;
test_literals;
test_types;
test_complex;
test_nulls;
test_method;
test_returns;
test_inputs;
test_outputs;
test_inouts;
test_mx;
test_const;
test_struct;

% ================================================================
$[

#include <stdio.h>
#include <string.h>

struct Pair {
    Pair(double x, double y) { xy[0] = x; xy[1] = y; }
    double xy[2];
    double x() { return xy[0]; }
    double y() { return xy[1]; }
};

struct BadPair {
    double x;
};

struct DerivedPair : public Pair {
    DerivedPair() : Pair(7,11) {}
};

#include <complex>
typedef std::complex<double> cmplx;
#define real_cmplx(z) (z).real()
#define imag_cmplx(z) (z).imag()
#define setz_cmplx(zp, r, i)  *zp = cmplx(r,i)

$]
% ================================================================
function test_mult_inherit
$[
class Parent1 {
public:
    Parent1(int data) : data1_(data) {}
    virtual ~Parent1() {}
    virtual int data1() { return data1_; }
protected:
    int data1_;
};

class Parent2 {
public:
    Parent2(int data) : data2_(data) {}
    virtual ~Parent2() {}
    virtual int data2() { return data2_; }
protected:
    int data2_;
};

class Child : public Parent1, public Parent2 {
public:
    Child() : Parent1(1), Parent2(2) {}
    virtual int data1() { return data1_ + 1; }
    virtual int data2() { return data2_ + 1; }
    int datas() { return data1_ + data2_; }
};

$]

# class Child : Parent1, Parent2;
# Child* c = new Child();
# int d1 = c->Parent1.data1();
# int d2 = c->Parent2.data2();
# int dd = c->Child.datas();

tassert(d1 == 2, 'Multiple inheritance handling (1)');
tassert(d2 == 3, 'Multiple inheritance handling (2)');
tassert(dd == 3, 'Multiple inheritance handling (3)');

% ================================================================
function test_scopes;

$ class OuterClass {
$ public:
$   static int static_method() { return 123; }
$ };
# int x = OuterClass::static_method();

tassert(x == 123, 'Access to static class method');

% ================================================================
function test_literals;

$ int literal_plus1(int x) { return x+1; }
# int y = literal_plus1(int 7);
# int l = strlen(cstring 'Test');
tassert(y == 8, 'Integer literals');
tassert(l == 4, 'String literals');

% ================================================================
function test_types;

$ typedef unsigned char byte;
$ void takes_double(double& x) {}
$ void takes_float(float& x) {}
$ void takes_long(long& x) {}
$ void takes_int(int& x) {}
$ void takes_char(char& x) {}
$ void takes_ulong(unsigned long& x) {}
$ void takes_uint(unsigned int& x) {}
$ void takes_uchar(unsigned char& x) {}
$ void takes_bool(bool& x) {}
$ void takes_size_t(size_t& x) {}

x = 0;
# typedef numeric byte;
# takes_double(double& x);
# takes_float(float& x);
# takes_long(long& x);
# takes_int(int& x);
# takes_char(char& x);
# takes_ulong(ulong& x);
# takes_uint(uint& x);
# takes_uchar(uchar& x);
# takes_uchar(byte& x);
# takes_bool(bool& x);
# takes_size_t(size_t& x);

# class DerivedPair : Pair;
# DerivedPair* dp = new DerivedPair();
# double x = dp->Pair.x();
tassert(x == 7, 'Type casting');

% ================================================================
function test_complex;

$ cmplx zsum(cmplx* zarray, int n) {
$     cmplx sum(0);
$     for (int i = 0; i < n; ++i) sum += zarray[i];
$     return sum;
$ }

zarray = rand(10,1) + 1i*rand(10,1);
n = length(zarray);
# typedef dcomplex cmplx;
# cmplx result = zsum(cmplx[] zarray, int n);
tassert(abs(result-sum(zarray)) < 1e-10*norm(zarray), 'Complex support');


% ================================================================
function test_nulls;

$ Pair* null_pair() { return NULL; }
# Pair* p = null_pair();
tassert(p == 0, 'Null pointer return');

$ int is_null(Pair* p) { return !p; }
# int flag = is_null(Pair* p);
tassert(flag, 'Null pointer input');

$ char* null_string() { return NULL; }
# cstring s = null_string();
tassert(s == 0, 'Null string return');

# char* c = null_string();
tassert(isempty(c), 'Null scalar pointer return');

nil = [];
$ int is_null(double* data) { return !data; }
# int flag = is_null(double[] nil);
tassert(flag, 'Null array input');

# char[1] ca = null_string();
tassert(isempty(ca), 'Null array return');

$ void test_null_obj(Pair& p) { }
try
  # test_null_obj(Pair p);
  tassert(0, 'Null argument dereference 1');
end
try
  # test_null_obj(Pair& p);
  tassert(0, 'Null argument dereference 1');
end

try
  # double x = p->Pair.x();
  tassert(0, 'Invalid this test');
end

# BadPair* bp = new BadPair();
try
  $ void test_bad_pair(Pair* p) { }
  # test_bad_pair(Pair* bp);  
  tassert(0, 'Invalid pointer test');
end
# delete(BadPair* bp);


% ================================================================
function test_method;

x = 1;
y = 2;
# Pair* p = new Pair(double x, double y);
# double xx = p->Pair.x();
# double yy = p->Pair.y();
# delete(Pair* p);
tassert(xx == 1, 'Method call');
tassert(yy == 2, 'Method call');


% ================================================================
function test_returns;

$ Pair test_return_obj() { return Pair(1.5, 2.5); }
# Pair p1 = test_return_obj();
tassert(sscanf(p1, 'Pair:%x') > 0, 'Return object');

$ double* test_return_array(Pair& p) { return p.xy; }
# double[2] xy = test_return_array(Pair& p1);
tassert(norm(xy-[1.5; 2.5]) == 0, 'Return array');

$ double* test_return_array2(Pair& p) { return p.xy; }
# double xy[2] = test_return_array2(Pair& p1);
tassert(norm(xy-[1.5; 2.5]) == 0, 'Return array');

$ double test_return_scalar(double* xy) { return xy[0] + xy[1]; }
# double sum = test_return_scalar(double[] xy);
tassert(sum == 4, 'Return scalar');

xy_z = [1+5i, 7+11i];
$ cmplx test_return_zscalar(cmplx* xy) { return xy[0] + xy[1]; }
# cmplx sum1 = test_return_zscalar(cmplx[] xy);
# cmplx sum2 = test_return_zscalar(cmplx[] xy_z);
tassert(sum1 == 4,     'Return zscalar (reals)');
tassert(sum2 == 8+16i, 'Return zscalar (complexes)');

$ const char* test_return_string() { return "Hello, world!"; }
# cstring s = test_return_string();
tassert(strcmp(s, 'Hello, world!'), 'Return string');

$ Pair* test_return_p_obj() { return new Pair(3, 5); }
# Pair* p2 = test_return_p_obj();
# double[2] xy = test_return_array(Pair& p2);
tassert(norm(xy - [3;5]) == 0, 'Return obj*');

a = 7; b = 11;
$ int* test_return_p_scalar(int* a, int* b) { return (*a > *b) ? a : b; }
# int* z1 = test_return_p_scalar(int* a, int* b);
tassert(z1 == 11, 'Return scalar*');

a_z = 7 + 10i; b_z = 11 + 15i;
$ cmplx* test_return_p_zscalar(cmplx* a, cmplx* b) { 
$     return (a->real() > b->real()) ? a : b; 
$ }
# cmplx* z1 = test_return_p_zscalar(cmplx* a, cmplx* b);
# cmplx* z2 = test_return_p_zscalar(cmplx* a_z, cmplx* b_z);
tassert(z1 == 11, 'Return zscalar*');
tassert(z2 == 11 + 15i, 'Return zscalar*');

$ Pair& test_return_r_obj(Pair& p) { return p; }
# Pair& p2c = test_return_r_obj(Pair& p2);
tassert(strcmp(p2, p2c), 'Return obj&');

$ int& test_return_r_scalar(int& a, int& b) { return (a > b) ? a : b; }
# int& z2 = test_return_r_scalar(int& a, int& b);
tassert(z2 == 11, 'Return scalar&');

$ cmplx& test_return_r_zscalar(cmplx& a, cmplx& b) { 
$     return (a.real() > b.real()) ? a : b; 
$ }
# cmplx& z2 = test_return_r_zscalar(cmplx& a, cmplx& b);
# cmplx& z3 = test_return_r_zscalar(cmplx& a_z, cmplx& b_z);
tassert(z2 == 11, 'Return zscalar&');
tassert(z3 == 11 + 15i, 'Return zscalar&');

# delete(Pair* p1);
# delete(Pair* p2);


% ================================================================
function test_inputs

x = 101; y = 202;
# Pair* p = new Pair(double x, double y);
$ double test_input_obj(Pair p) { return p.xy[0] + p.xy[1]; }
# double sum = test_input_obj(input Pair p);
tassert(sum == 303, 'Input obj');

xy = [11, 22];
$ double test_input_array(double* xy) { return xy[0] + xy[1]; }
# double sum = test_input_array(double[2] xy);
tassert(sum == 33, 'Input array');

$ double test_input_array2(double* xy) { return xy[0] + xy[1]; }
# double sum = test_input_array2(double xy[2]);
tassert(sum == 33, 'Input array');

xy_z = [11 + 5i, 22 + 6i];
$ cmplx test_input_zarray(cmplx* xy) { return xy[0] + xy[1]; }
# cmplx sum = test_input_zarray(cmplx[2] xy);
# cmplx sum2 = test_input_zarray(cmplx[2] xy_z);
tassert(sum == 33, 'Input zarray');
tassert(sum2 == 33 + 11i, 'Input zarray');

$ int test_input_scalar(int x) { return x+1; }
# int xp1 = test_input_scalar(int x);
tassert(xp1 == 102, 'Input scalar');

x_z = 101 + 99i;
$ cmplx test_input_zscalar(cmplx x) { return x+1.0; }
# cmplx xp1 = test_input_zscalar(cmplx x);
# cmplx xp1z = test_input_zscalar(cmplx x_z);
tassert(xp1 == 102, 'Input zscalar');
tassert(xp1z == 102 + 99i, 'Input zscalar');

msg = 'Hello, world!';
$ int test_input_string(char* s) { return strlen(s); }
# int msglen = test_input_string(cstring msg);
tassert(msglen == length(msg), 'Input string');

$ double test_input_p_obj(Pair* p) { return p->xy[0] + p->xy[1]; }
# double sum2 = test_input_p_obj(Pair* p);
tassert(sum2 == 303, 'Input obj*');

$ int test_input_p_scalar(int* x) { return *x+1; }
# int xp1b = test_input_p_scalar(int* x);
tassert(xp1b == 102, 'Input scalar*');

$ cmplx test_input_p_zscalar(cmplx* x) { return *x+1.0; }
# cmplx xp1b = test_input_p_zscalar(cmplx* x);
# cmplx xp1c = test_input_p_zscalar(cmplx* x_z);
tassert(xp1b == 102, 'Input zscalar*');
tassert(xp1c == 102 + 99i, 'Input zscalar*');

$ double test_input_r_obj(Pair& p) { return p.xy[0] + p.xy[1]; }
# double sum3 = test_input_r_obj(Pair& p);
tassert(sum3 == 303, 'Input obj&');

$ int test_input_r_scalar(int& x) { return x+1; }
# int xp1c = test_input_r_scalar(input int& x);
tassert(xp1c == 102, 'Input scalar&');

$ cmplx test_input_r_zscalar(cmplx& x) { return x+1.0; }
# cmplx xp1c = test_input_r_zscalar(input cmplx& x);
# cmplx xp1d = test_input_r_zscalar(input cmplx& x_z);
tassert(xp1c == 102, 'Input scalar&');
tassert(xp1d == 102 + 99i, 'Input scalar&');

# delete(input Pair* p);


% ================================================================
function test_outputs

$ void test_output_array(double* xy) { xy[0] = 1; xy[1] = 2; }
# test_output_array(output double[2] xy);
tassert(norm(xy-[1;2]) == 0, 'Output array');

$ void test_output_rarray(const double*& xy) { 
$   static double result[2] = {7, 11};
$   xy = result;
$ }
# test_output_rarray(output double[2]& xyr);
tassert(norm(xyr-[7;11]) == 0, 'Output rarray');

$ void test_output_rarray2(const double*& xy) { xy = NULL; }
# test_output_rarray2(output double[2]& xyr2);
tassert(isempty(xyr2), 'Output rarray');

$ void test_output_zarray(cmplx* xy) { xy[0] = 1; xy[1] = 2; }
$ void test_output_zarray2(cmplx* xy) { xy[0] = cmplx(1,3); xy[1] = 2; }
# test_output_zarray(output cmplx[2] xy);
# test_output_zarray2(output cmplx[2] xy_z);
tassert(norm(xy-[1;2]) == 0, 'Output array');
tassert(norm(xy_z-[1+3i;2]) == 0, 'Output array');

fmt = '= %d'; i = 101;
# sprintf(output cstring[128] buf, input cstring fmt, input int i);
tassert(strcmp('= 101', buf), 'Output string');

$ void test_output_p_scalar(int* i) { *i = 202; }
# test_output_p_scalar(output int* i2);
tassert(i2 == 202, 'Output scalar*');

$ void test_output_p_zscalar(cmplx* z) { *z = cmplx(202,303); }
# test_output_p_zscalar(output cmplx* z2);
tassert(z2 == 202+303i, 'Output zscalar*');

$ void test_output_r_scalar(int& i) { i = 303; }
# test_output_r_scalar(output int& i3);
tassert(i3 == 303, 'Output scalar&');

$ void test_output_r_zscalar(cmplx& z) { z = cmplx(303,404); }
# test_output_r_zscalar(output cmplx& z3);
tassert(z3 == 303+404i, 'Output zscalar&');


% ================================================================
function test_inouts

xy = [1, 2];
$ void test_inout_array(double* xy) { xy[0] += 1; xy[1] += 1; }
# test_inout_array(inout double[] xy);
tassert(norm(xy - [2,3]) == 0, 'Inout array');

s1 = 'foo'; 
s2 = 'bar';
# strcat(inout cstring[128] s1, input cstring s2);
tassert(strcmp(s1, 'foobar'), 'Inout string');

i1 = 101;
$ void test_inout_p_scalar(int* i) { *i += 202; }
# test_inout_p_scalar(inout int* i1);
tassert(i1 == 303, 'Inout scalar*');

i2 = 101;
$ void test_inout_r_scalar(int& i) { i += 303; }
# test_inout_r_scalar(inout int& i2);
tassert(i2 == 404, 'Inout scalar&');


% ================================================================
function test_mx

$ #include <mex.h>

in1 = 42;
$ double test_mx_input(const mxArray* x) { return *mxGetPr(x); }
# double out1 = test_mx_input(input mxArray in1);
tassert(out1 == 42, 'Input mx');

$ void test_mx_output(mxArray** x)
$ {
$     *x = mxCreateString("foobar");
$ }
# test_mx_output(output mxArray out2);
tassert(strcmp(out2, 'foobar'), 'Output mx');

$ mxArray* test_mx_return() 
$ { 
$     mxArray* m = mxCreateDoubleMatrix(1,1, mxREAL);
$     *mxGetPr(m) = 42;
$     return m;
$ }
# mxArray out3 = test_mx_return();
tassert(out3 == 42, 'Return mx');


% ================================================================
function test_const

$ const int TEST_CONST = 42;
$ int identity(int i) { return i; }
# int result = identity(const TEST_CONST);
tassert(result == 42, 'Constant transfer');
# int result2 = identity(const 'TEST_CONST');
tassert(result2 == 42, 'Constant transfer');

% ================================================================
function test_struct

$[

struct my_struct_t {
    double x;
    double y;
};

int my_struct_allocs = 0;

int get_my_struct_allocs()
{
    return my_struct_allocs;
}

my_struct_t* mxWrapGet_my_struct_t(const mxArray* a, const char** e)
{
    // Note -- there really ought to be an error check here
    ++my_struct_allocs;
    my_struct_t* o = new my_struct_t;
    o->x = mxGetPr(a)[0];
    o->y = mxGetPr(a)[1];
    return o;
}

mxArray* mxWrapSet_my_struct_t(my_struct_t* o)
{
    mxArray* a = mxCreateDoubleMatrix(2,1,mxREAL);
    mxGetPr(a)[0] = o->x;
    mxGetPr(a)[1] = o->y;
    return a;
}

my_struct_t* mxWrapAlloc_my_struct_t()
{
    ++my_struct_allocs;
    return new my_struct_t;
}

void mxWrapFree_my_struct_t(my_struct_t* o)
{
    --my_struct_allocs;
    delete o;
}

void unpack_struct(my_struct_t& o, double* xy)
{
    xy[0] = o.x;
    xy[1] = o.y;
}

void pack_struct(my_struct_t& o, double* xy)
{
    o.x = xy[0];
    o.y = xy[1];
}

void swap_struct(my_struct_t& o)
{
    double tmp = o.x;
    o.x = o.y;
    o.y = tmp;
}

my_struct_t& rightmost(my_struct_t& p1, my_struct_t& p2)
{
    return (p1.x >= p2.x) ? p1 : p2;
}

my_struct_t* add1(my_struct_t& o)
{
    o.x += 1;
    o.y += 1;
    return &o;
}

$]

# typedef mxArray my_struct_t;

xy1 = [1, 2];
# unpack_struct(my_struct_t& xy1, output double xy2[2]);
tassert(norm(xy2-[1;2]) == 0, 'Structure conversion on input');

# pack_struct(output my_struct_t xy3, double[] xy1);
tassert(norm(xy3-[1;2]) == 0, 'Structure conversion on output');

xy4 = [3; 4];
# swap_struct(inout my_struct_t xy4);
tassert(norm(xy4-[4; 3]) == 0, 'Structure on inout');

# my_struct_t& result = rightmost(my_struct_t& xy1, my_struct_t& xy4);
tassert(norm(result-[4;3]) == 0, 'Structure on reference return');

# my_struct_t* xy5 = add1(my_struct_t& xy4);
tassert(norm(xy5-[5;4]) == 0, 'Structure on pointer return');

# int alloc_count = get_my_struct_allocs();
tassert(alloc_count == 0, 'Balanced allocations in structure management');

% ================================================================
function tassert(pred, msg)

if ~pred, fprintf('Failure: %s\n', msg); end