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test_optional.cpp
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test_optional.cpp
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// Copyright (C) 2011 - 2012 Andrzej Krzemienski.
//
// Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// The idea and interface is based on Boost.Optional library
// authored by Fernando Luis Cacciola Carballal
# include "optional.hpp"
# include <vector>
# include <iostream>
# include <functional>
# include <complex>
struct caller {
template <class T> caller(T fun) { fun(); }
};
# define CAT2(X, Y) X ## Y
# define CAT(X, Y) CAT2(X, Y)
# define TEST(NAME) caller CAT(__VAR, __LINE__) = []
enum State
{
sDefaultConstructed,
sValueCopyConstructed,
sValueMoveConstructed,
sCopyConstructed,
sMoveConstructed,
sMoveAssigned,
sCopyAssigned,
sValueCopyAssigned,
sValueMoveAssigned,
sMovedFrom,
sValueConstructed
};
struct OracleVal
{
State s;
int i;
OracleVal(int i = 0) : s(sValueConstructed), i(i) {}
};
struct Oracle
{
State s;
OracleVal val;
Oracle() : s(sDefaultConstructed) {}
Oracle(const OracleVal& v) : s(sValueCopyConstructed), val(v) {}
Oracle(OracleVal&& v) : s(sValueMoveConstructed), val(std::move(v)) {v.s = sMovedFrom;}
Oracle(const Oracle& o) : s(sCopyConstructed), val(o.val) {}
Oracle(Oracle&& o) : s(sMoveConstructed), val(std::move(o.val)) {o.s = sMovedFrom;}
Oracle& operator=(const OracleVal& v) { s = sValueCopyConstructed; val = v; return *this; }
Oracle& operator=(OracleVal&& v) { s = sValueMoveConstructed; val = std::move(v); v.s = sMovedFrom; return *this; }
Oracle& operator=(const Oracle& o) { s = sCopyConstructed; val = o.val; return *this; }
Oracle& operator=(Oracle&& o) { s = sMoveConstructed; val = std::move(o.val); o.s = sMovedFrom; return *this; }
};
struct Guard
{
std::string val;
Guard() : val{} {}
explicit Guard(std::string s, int = 0) : val(s) {}
Guard(const Guard&) = delete;
Guard(Guard&&) = delete;
void operator=(const Guard&) = delete;
void operator=(Guard&&) = delete;
};
struct ExplicitStr
{
std::string s;
explicit ExplicitStr(const char* chp) : s(chp) {};
};
struct Date
{
int i;
Date() = delete;
Date(int i) : i{i} {};
Date(Date&& d) : i(d.i) { d.i = 0; }
Date(const Date&) = delete;
Date& operator=(const Date&) = delete;
Date& operator=(Date&& d) { i = d.i; d.i = 0; return *this;};
};
bool operator==( Oracle const& a, Oracle const& b ) { return a.val.i == b.val.i; }
bool operator!=( Oracle const& a, Oracle const& b ) { return a.val.i != b.val.i; }
namespace tr2 = std::experimental;
TEST(disengaged_ctor)
{
tr2::optional<int> o1;
assert (!o1);
tr2::optional<int> o2 = tr2::nullopt;
assert (!o2);
tr2::optional<int> o3 = o2;
assert (!o3);
assert (o1 == tr2::nullopt);
assert (o1 == tr2::optional<int>{});
assert (!o1);
assert (bool(o1) == false);
assert (o2 == tr2::nullopt);
assert (o2 == tr2::optional<int>{});
assert (!o2);
assert (bool(o2) == false);
assert (o3 == tr2::nullopt);
assert (o3 == tr2::optional<int>{});
assert (!o3);
assert (bool(o3) == false);
assert (o1 == o2);
assert (o2 == o1);
assert (o1 == o3);
assert (o3 == o1);
assert (o2 == o3);
assert (o3 == o2);
};
TEST(value_ctor)
{
OracleVal v;
tr2::optional<Oracle> oo1(v);
assert (oo1 != tr2::nullopt);
assert (oo1 != tr2::optional<Oracle>{});
assert (oo1 == tr2::optional<Oracle>{v});
assert (!!oo1);
assert (bool(oo1));
// NA: assert (oo1->s == sValueCopyConstructed);
assert (oo1->s == sMoveConstructed);
assert (v.s == sValueConstructed);
tr2::optional<Oracle> oo2(std::move(v));
assert (oo2 != tr2::nullopt);
assert (oo2 != tr2::optional<Oracle>{});
assert (oo2 == oo1);
assert (!!oo2);
assert (bool(oo2));
// NA: assert (oo2->s == sValueMoveConstructed);
assert (oo2->s == sMoveConstructed);
assert (v.s == sMovedFrom);
{
OracleVal v;
tr2::optional<Oracle> oo1{tr2::in_place, v};
assert (oo1 != tr2::nullopt);
assert (oo1 != tr2::optional<Oracle>{});
assert (oo1 == tr2::optional<Oracle>{v});
assert (!!oo1);
assert (bool(oo1));
assert (oo1->s == sValueCopyConstructed);
assert (v.s == sValueConstructed);
tr2::optional<Oracle> oo2{tr2::in_place, std::move(v)};
assert (oo2 != tr2::nullopt);
assert (oo2 != tr2::optional<Oracle>{});
assert (oo2 == oo1);
assert (!!oo2);
assert (bool(oo2));
assert (oo2->s == sValueMoveConstructed);
assert (v.s == sMovedFrom);
}
};
TEST(assignment)
{
tr2::optional<int> oi;
oi = tr2::optional<int>{1};
assert (*oi == 1);
oi = tr2::nullopt;
assert (!oi);
oi = 2;
assert (*oi == 2);
oi = {};
assert (!oi);
};
template <class T>
struct MoveAware
{
T val;
bool moved;
MoveAware(T val) : val(val), moved(false) {}
MoveAware(MoveAware const&) = delete;
MoveAware(MoveAware&& rhs) : val(rhs.val), moved(rhs.moved) {
rhs.moved = true;
}
MoveAware& operator=(MoveAware const&) = delete;
MoveAware& operator=(MoveAware&& rhs) {
val = (rhs.val);
moved = (rhs.moved);
rhs.moved = true;
return *this;
}
};
TEST(moved_from_state)
{
// first, test mock:
MoveAware<int> i{1}, j{2};
assert (i.val == 1);
assert (!i.moved);
assert (j.val == 2);
assert (!j.moved);
MoveAware<int> k = std::move(i);
assert (k.val == 1);
assert (!k.moved);
assert (i.val == 1);
assert (i.moved);
k = std::move(j);
assert (k.val == 2);
assert (!k.moved);
assert (j.val == 2);
assert (j.moved);
// now, test optional
tr2::optional<MoveAware<int>> oi{1}, oj{2};
assert (oi);
assert (!oi->moved);
assert (oj);
assert (!oj->moved);
tr2::optional<MoveAware<int>> ok = std::move(oi);
assert (ok);
assert (!ok->moved);
assert (oi);
assert (oi->moved);
ok = std::move(oj);
assert (ok);
assert (!ok->moved);
assert (oj);
assert (oj->moved);
};
TEST(copy_move_ctor_optional_int)
{
tr2::optional<int> oi;
tr2::optional<int> oj = oi;
assert (!oj);
assert (oj == oi);
assert (oj == tr2::nullopt);
assert (!bool(oj));
oi = 1;
tr2::optional<int> ok = oi;
assert (!!ok);
assert (bool(ok));
assert (ok == oi);
assert (ok != oj);
assert (*ok == 1);
tr2::optional<int> ol = std::move(oi);
assert (!!ol);
assert (bool(ol));
assert (ol == oi);
assert (ol != oj);
assert (*ol == 1);
};
TEST(optional_optional)
{
tr2::optional<tr2::optional<int>> oi1 = tr2::nullopt;
assert (oi1 == tr2::nullopt);
assert (!oi1);
{
tr2::optional<tr2::optional<int>> oi2 {tr2::in_place};
assert (oi2 != tr2::nullopt);
assert (bool(oi2));
assert (*oi2 == tr2::nullopt);
//assert (!(*oi2));
//std::cout << typeid(**oi2).name() << std::endl;
}
{
tr2::optional<tr2::optional<int>> oi2 {tr2::in_place, tr2::nullopt};
assert (oi2 != tr2::nullopt);
assert (bool(oi2));
assert (*oi2 == tr2::nullopt);
assert (!*oi2);
}
{
tr2::optional<tr2::optional<int>> oi2 {tr2::optional<int>{}};
assert (oi2 != tr2::nullopt);
assert (bool(oi2));
assert (*oi2 == tr2::nullopt);
assert (!*oi2);
}
tr2::optional<int> oi;
auto ooi = tr2::make_optional(oi);
static_assert( std::is_same<tr2::optional<tr2::optional<int>>, decltype(ooi)>::value, "");
};
TEST(example_guard)
{
using namespace tr2;
//FAILS: optional<Guard> ogx(Guard("res1"));
//FAILS: optional<Guard> ogx = "res1";
//FAILS: optional<Guard> ogx("res1");
optional<Guard> oga; // Guard is non-copyable (and non-moveable)
optional<Guard> ogb(in_place, "res1"); // initialzes the contained value with "res1"
assert (bool(ogb));
assert (ogb->val == "res1");
optional<Guard> ogc(in_place); // default-constructs the contained value
assert (bool(ogc));
assert (ogc->val == "");
oga.emplace("res1"); // initialzes the contained value with "res1"
assert (bool(oga));
assert (oga->val == "res1");
oga.emplace(); // destroys the contained value and
// default-constructs the new one
assert (bool(oga));
assert (oga->val == "");
oga = nullopt; // OK: make disengaged the optional Guard
assert (!(oga));
//FAILS: ogb = {}; // ERROR: Guard is not Moveable
};
void process(){}
void process(int ){}
void processNil(){}
TEST(example1)
{
using namespace tr2;
optional<int> oi; // create disengaged object
optional<int> oj = nullopt; // alternative syntax
oi = oj; // assign disengaged object
optional<int> ok = oj; // ok is disengaged
if (oi) assert(false); // 'if oi is engaged...'
if (!oi) assert(true); // 'if oi is disengaged...'
if (oi != nullopt) assert(false); // 'if oi is engaged...'
if (oi == nullopt) assert(true); // 'if oi is disengaged...'
assert(oi == ok); // two disengaged optionals compare equal
///////////////////////////////////////////////////////////////////////////
optional<int> ol{1}; // ol is engaged; its contained value is 1
ok = 2; // ok becomes engaged; its contained value is 2
oj = ol; // oj becomes engaged; its contained value is 1
assert(oi != ol); // disengaged != engaged
assert(ok != ol); // different contained values
assert(oj == ol); // same contained value
assert(oi < ol); // disengaged < engaged
assert(ol < ok); // less by contained value
/////////////////////////////////////////////////////////////////////////////
optional<int> om{1}; // om is engaged; its contained value is 1
optional<int> on = om; // on is engaged; its contained value is 1
om = 2; // om is engaged; its contained value is 2
assert (on != om); // on still contains 3. They are not pointers
/////////////////////////////////////////////////////////////////////////////
int i = *ol; // i obtains the value contained in ol
assert (i == 1);
*ol = 9; // the object contained in ol becomes 9
assert(*ol == 9);
assert(ol == make_optional(9));
///////////////////////////////////
int p = 1;
optional<int> op = p;
assert(*op == 1);
p = 2;
assert(*op == 1); // value contained in op is separated from p
////////////////////////////////
if (ol)
process(*ol); // use contained value if present
else
process(); // proceed without contained value
if (!om)
processNil();
else
process(*om);
/////////////////////////////////////////
process(ol.value_or(0)); // use 0 if ol is disengaged
////////////////////////////////////////////
ok = nullopt; // if ok was engaged calls T's dtor
oj = {}; // assigns a temporary disengaged optional
};
TEST(example_guard)
{
using std::experimental::optional;
const optional<int> c = 4;
int i = *c; // i becomes 4
assert (i == 4);
// FAILS: *c = i; // ERROR: cannot assign to const int&
};
TEST(example_ref)
{
using namespace std::experimental;
int i = 1;
int j = 2;
optional<int&> ora; // disengaged optional reference to int
optional<int&> orb = i; // contained reference refers to object i
*orb = 3; // i becomes 3
// FAILS: ora = j; // ERROR: optional refs do not have assignment from T
// FAILS: ora = {j}; // ERROR: optional refs do not have copy/move assignment
// FAILS: ora = orb; // ERROR: no copy/move assignment
ora.emplace(j); // OK: contained reference refers to object j
ora.emplace(i); // OK: contained reference now refers to object i
ora = nullopt; // OK: ora becomes disengaged
};
template <typename T>
T getValue( tr2::optional<T> newVal = tr2::nullopt, tr2::optional<T&> storeHere = tr2::nullopt )
{
T cached{};
if (newVal) {
cached = *newVal;
if (storeHere) {
*storeHere = *newVal; // LEGAL: assigning T to T
}
}
return cached;
}
TEST(example_optional_arg)
{
int iii = 0;
iii = getValue<int>(iii, iii);
iii = getValue<int>(iii);
iii = getValue<int>();
{
using namespace std::experimental;
optional<Guard> grd1{in_place, "res1", 1}; // guard 1 initialized
optional<Guard> grd2;
grd2.emplace("res2", 2); // guard 2 initialized
grd1 = nullopt; // guard 1 released
} // guard 2 released (in dtor)
};
std::tuple<Date, Date, Date> getStartMidEnd() { return std::tuple<Date, Date, Date>{Date{1}, Date{2}, Date{3}}; }
void run(Date const&, Date const&, Date const&) {}
TEST(example_date)
{
using namespace std::experimental;
optional<Date> start, mid, end; // Date doesn't have default ctor (no good default date)
std::tie(start, mid, end) = getStartMidEnd();
run(*start, *mid, *end);
};
std::experimental::optional<char> readNextChar(){ return{}; }
void run(std::experimental::optional<std::string>) {}
void run(std::complex<double>) {}
template <class T>
void assign_norebind(tr2::optional<T&>& optref, T& obj)
{
if (optref) *optref = obj;
else optref.emplace(obj);
}
template <typename T> void unused(T&&) {}
TEST(example_conceptual_model)
{
using namespace std::experimental;
optional<int> oi = 0;
optional<int> oj = 1;
optional<int> ok = nullopt;
oi = 1;
oj = nullopt;
ok = 0;
unused(oi == nullopt);
unused(oj == 0);
unused(ok == 1);
};
TEST(example_rationale)
{
using namespace std::experimental;
if (optional<char> ch = readNextChar()) {
unused(ch);
// ...
}
//////////////////////////////////
optional<int> opt1 = nullopt;
optional<int> opt2 = {};
opt1 = nullopt;
opt2 = {};
if (opt1 == nullopt) {}
if (!opt2) {}
if (opt2 == optional<int>{}) {}
////////////////////////////////
run(nullopt); // pick the second overload
// FAILS: run({}); // ambiguous
if (opt1 == nullopt) {} // fine
// FAILS: if (opt2 == {}) {} // ilegal
////////////////////////////////
assert (optional<unsigned>{} < optional<unsigned>{0});
assert (optional<unsigned>{0} < optional<unsigned>{1});
assert (!(optional<unsigned>{} < optional<unsigned>{}) );
assert (!(optional<unsigned>{1} < optional<unsigned>{1}));
assert (optional<unsigned>{} != optional<unsigned>{0});
assert (optional<unsigned>{0} != optional<unsigned>{1});
assert (optional<unsigned>{} == optional<unsigned>{} );
assert (optional<unsigned>{0} == optional<unsigned>{0});
/////////////////////////////////
optional<int> o;
o = make_optional(1); // copy/move assignment
o = 1; // assignment from T
o.emplace(1); // emplacement
////////////////////////////////////
int isas = 0, i = 9;
optional<int&> asas = i;
assign_norebind(asas, isas);
/////////////////////////////////////
////tr2::optional<std::vector<int>> ov2 = {2, 3};
////assert (bool(ov2));
////assert ((*ov2)[1] == 3);
////
////////////////////////////////
////std::vector<int> v = {1, 2, 4, 8};
////optional<std::vector<int>> ov = {1, 2, 4, 8};
////assert (v == *ov);
////
////ov = {1, 2, 4, 8};
////std::allocator<int> a;
////optional<std::vector<int>> ou { in_place, {1, 2, 4, 8}, a };
////assert (ou == ov);
//////////////////////////////
// inconvenient syntax:
{
tr2::optional<std::vector<int>> ov2{tr2::in_place, {2, 3}};
assert (bool(ov2));
assert ((*ov2)[1] == 3);
////////////////////////////
std::vector<int> v = {1, 2, 4, 8};
optional<std::vector<int>> ov{tr2::in_place, {1, 2, 4, 8}};
assert (v == *ov);
ov.emplace({1, 2, 4, 8});
/*
std::allocator<int> a;
optional<std::vector<int>> ou { in_place, {1, 2, 4, 8}, a };
assert (ou == ov);
*/
}
/////////////////////////////////
{
typedef int T;
optional<optional<T>> ot {in_place};
optional<optional<T>> ou {in_place, nullopt};
optional<optional<T>> ov {optional<T>{}};
optional<int> oi;
auto ooi = make_optional(oi);
static_assert( std::is_same<optional<optional<int>>, decltype(ooi)>::value, "");
}
};
bool fun(std::string , std::experimental::optional<int> oi = std::experimental::nullopt)
{
return bool(oi);
}
TEST(example_converting_ctor)
{
using namespace std::experimental;
assert (true == fun("dog", 2));
assert (false == fun("dog"));
assert (false == fun("dog", nullopt)); // just to be explicit
};
TEST(bad_comparison)
{
tr2::optional<int> oi, oj;
int i;
bool b = (oi == oj);
b = (oi >= i);
b = (oi == i);
unused(b);
};
//// NOT APPLICABLE ANYMORE
////TEST(perfect_ctor)
////{
//// //tr2::optional<std::string> ois = "OS";
//// assert (*ois == "OS");
////
//// // FAILS: tr2::optional<ExplicitStr> oes = "OS";
//// tr2::optional<ExplicitStr> oes{"OS"};
//// assert (oes->s == "OS");
////};
TEST(value_or)
{
tr2::optional<int> oi = 1;
int i = oi.value_or(0);
assert (i == 1);
oi = tr2::nullopt;
assert (oi.value_or(3) == 3);
tr2::optional<std::string> os{"AAA"};
assert (os.value_or("BBB") == "AAA");
os = {};
assert (os.value_or("BBB") == "BBB");
};
TEST(mixed_order)
{
using namespace std::experimental;
optional<int> oN {nullopt};
optional<int> o0 {0};
optional<int> o1 {1};
assert ( (oN < 0));
assert ( (oN < 1));
assert (!(o0 < 0));
assert ( (o0 < 1));
assert (!(o1 < 0));
assert (!(o1 < 1));
assert (!(oN >= 0));
assert (!(oN >= 1));
assert ( (o0 >= 0));
assert (!(o0 >= 1));
assert ( (o1 >= 0));
assert ( (o1 >= 1));
assert (!(oN > 0));
assert (!(oN > 1));
assert (!(o0 > 0));
assert (!(o0 > 1));
assert ( (o1 > 0));
assert (!(o1 > 1));
assert ( (oN <= 0));
assert ( (oN <= 1));
assert ( (o0 <= 0));
assert ( (o0 <= 1));
assert (!(o1 <= 0));
assert ( (o1 <= 1));
assert ( (0 > oN));
assert ( (1 > oN));
assert (!(0 > o0));
assert ( (1 > o0));
assert (!(0 > o1));
assert (!(1 > o1));
assert (!(0 <= oN));
assert (!(1 <= oN));
assert ( (0 <= o0));
assert (!(1 <= o0));
assert ( (0 <= o1));
assert ( (1 <= o1));
assert (!(0 < oN));
assert (!(1 < oN));
assert (!(0 < o0));
assert (!(1 < o0));
assert ( (0 < o1));
assert (!(1 < o1));
assert ( (0 >= oN));
assert ( (1 >= oN));
assert ( (0 >= o0));
assert ( (1 >= o0));
assert (!(0 >= o1));
assert ( (1 >= o1));
};
struct BadRelops
{
int i;
};
constexpr bool operator<(BadRelops a, BadRelops b) { return a.i < b.i; }
constexpr bool operator>(BadRelops a, BadRelops b) { return a.i < b.i; } // intentional error!
TEST(bad_relops)
{
using namespace std::experimental;
BadRelops a{1}, b{2};
assert (a < b);
assert (a > b);
optional<BadRelops> oa = a, ob = b;
assert (oa < ob);
assert (!(oa > ob));
assert (oa < b);
assert (oa > b);
optional<BadRelops&> ra = a, rb = b;
assert (ra < rb);
assert (!(ra > rb));
assert (ra < b);
assert (ra > b);
};
TEST(mixed_equality)
{
using namespace std::experimental;
assert (make_optional(0) == 0);
assert (make_optional(1) == 1);
assert (make_optional(0) != 1);
assert (make_optional(1) != 0);
optional<int> oN {nullopt};
optional<int> o0 {0};
optional<int> o1 {1};
assert (o0 == 0);
assert ( 0 == o0);
assert (o1 == 1);
assert ( 1 == o1);
assert (o1 != 0);
assert ( 0 != o1);
assert (o0 != 1);
assert ( 1 != o0);
assert ( 1 != oN);
assert ( 0 != oN);
assert (oN != 1);
assert (oN != 0);
assert (!( 1 == oN));
assert (!( 0 == oN));
assert (!(oN == 1));
assert (!(oN == 0));
std::string cat{"cat"}, dog{"dog"};
optional<std::string> oNil{}, oDog{"dog"}, oCat{"cat"};
assert (oCat == cat);
assert ( cat == oCat);
assert (oDog == dog);
assert ( dog == oDog);
assert (oDog != cat);
assert ( cat != oDog);
assert (oCat != dog);
assert ( dog != oCat);
assert ( dog != oNil);
assert ( cat != oNil);
assert (oNil != dog);
assert (oNil != cat);
assert (!( dog == oNil));
assert (!( cat == oNil));
assert (!(oNil == dog));
assert (!(oNil == cat));
};
TEST(const_propagation)
{
using namespace std::experimental;
optional<int> mmi{0};
static_assert(std::is_same<decltype(*mmi), int&>::value, "WTF");
const optional<int> cmi{0};
static_assert(std::is_same<decltype(*cmi), const int&>::value, "WTF");
optional<const int> mci{0};
static_assert(std::is_same<decltype(*mci), const int&>::value, "WTF");
optional<const int> cci{0};
static_assert(std::is_same<decltype(*cci), const int&>::value, "WTF");
};
static_assert(std::is_base_of<std::logic_error, std::experimental::bad_optional_access>::value, "");
TEST(safe_value)
{
using namespace std::experimental;
try {
optional<int> ovN{}, ov1{1};
int& r1 = ov1.value();
assert (r1 == 1);
try {
ovN.value();
assert (false);
}
catch (bad_optional_access const&) {
}
{ // ref variant
int i1 = 1;
optional<int&> orN{}, or1{i1};
int& r2 = or1.value();
assert (r2 == 1);
try {
orN.value();
assert (false);
}
catch (bad_optional_access const&) {
}
}
}
catch(...) {
assert (false);
}
};
TEST(optional_ref)
{
using namespace tr2;
// FAILS: optional<int&&> orr;
// FAILS: optional<nullopt_t&> on;
int i = 8;
optional<int&> ori;
assert (!ori);
ori.emplace(i);
assert (bool(ori));
assert (*ori == 8);
assert (&*ori == &i);
*ori = 9;
assert (i == 9);
// FAILS: int& ir = ori.value_or(i);
int ii = ori.value_or(i);
assert (ii == 9);
ii = 7;
assert (*ori == 9);
int j = 22;
auto&& oj = make_optional(std::ref(j));
*oj = 23;
assert (&*oj == &j);
assert (j == 23);
};
TEST(optional_ref_const_propagation)
{
using namespace std::experimental;
int i = 9;
const optional<int&> mi = i;
int& r = *mi;
optional<const int&> ci = i;
static_assert(std::is_same<decltype(*mi), int&>::value, "WTF");
static_assert(std::is_same<decltype(*ci), const int&>::value, "WTF");
unused(r);
};
TEST(optional_ref_assign)
{
using namespace std::experimental;
int i = 9;
optional<int&> ori = i;
int j = 1;
ori = optional<int&>{j};
ori = {j};
// FAILS: ori = j;
optional<int&> orx = ori;
ori = orx;
optional<int&> orj = j;
assert (ori);
assert (*ori == 1);
assert (ori == orj);
assert (i == 9);
*ori = 2;
assert (*ori == 2);
assert (ori == 2);
assert (2 == ori);
assert (ori != 3);
assert (ori == orj);
assert (j == 2);
assert (i == 9);
ori = {};
assert (!ori);
assert (ori != orj);
assert (j == 2);
assert (i == 9);
};
TEST(optional_ref_swap)
{
using namespace std::experimental;
int i = 0;
int j = 1;
optional<int&> oi = i;
optional<int&> oj = j;
assert (&*oi == &i);
assert (&*oj == &j);
swap(oi, oj);
assert (&*oi == &j);
assert (&*oj == &i);
};
TEST(optional_initialization)
{
using namespace tr2;
using std::string;
string s = "STR";