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optional.t.cpp
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optional.t.cpp
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//
// Copyright 2014-2021 by Martin Moene
//
// Distributed under 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)
//
// optional lite is inspired on std::optional by Fernando Cacciola and Andrzej Krzemienski
// and on expected lite by Martin Moene.
#include "optional-main.t.hpp"
using namespace nonstd;
#if optional_USES_STD_OPTIONAL && defined(__APPLE__)
# define opt_value( o ) *o
#else
# define opt_value( o ) o.value()
#endif
namespace {
struct nonpod { nonpod(){} };
struct Implicit { int x; Implicit(int v) : x(v) {} };
struct Explicit { int x; explicit Explicit(int v) : x(v) {} };
bool operator==( Implicit a, Implicit b ) { return a.x == b.x; }
bool operator==( Explicit a, Explicit b ) { return a.x == b.x; }
std::ostream & operator<<( std::ostream & os, Implicit i ) { return os << "Implicit:" << i.x; }
std::ostream & operator<<( std::ostream & os, Explicit e ) { return os << "Explicit:" << e.x; }
// ensure comparison of pointers for lest:
// const void * lest_nullptr = 0;
// The following tracer code originates as Oracle from Optional by
// Andrzej Krzemienski, https://github.com/akrzemi1/Optional.
enum State
{
/* 0 */ default_constructed,
/* 1 */ value_copy_constructed,
/* 2 */ value_move_constructed,
/* 3 */ copy_constructed,
/* 4 */ move_constructed,
/* 5 */ move_assigned,
/* 6 */ copy_assigned,
/* 7 */ value_copy_assigned,
/* 8 */ value_move_assigned,
/* 9 */ moved_from,
/*10 */ value_constructed
};
struct V
{
State state;
int value;
V( ) : state( default_constructed ), value( deflt() ) {}
V( int v ) : state( value_constructed ), value( v ) {}
bool operator==( V const & rhs ) const { return state == rhs.state && value == rhs.value; }
bool operator==( int val ) const { return value == val; }
static int deflt() { return 42; }
};
struct S
{
State state;
V value;
S( ) : state( default_constructed ) {}
S( V const & v ) : state( value_copy_constructed ), value( v ) {}
S( S const & s ) : state( copy_constructed ), value( s.value ) {}
S & operator=( V const & v ) { state = value_copy_assigned; value = v; return *this; }
S & operator=( const S & s ) { state = copy_assigned ; value = s.value; return *this; }
#if optional_CPP11_OR_GREATER
S( V && v ) : state( value_move_constructed ), value( std::move( v ) ) { v.state = moved_from; }
S( S && s ) : state( move_constructed ), value( std::move( s.value ) ) { s.state = moved_from; }
S & operator=( V && v ) { state = value_move_assigned ; value = std::move( v ); v.state = moved_from; return *this; }
S & operator=( S && s ) { state = move_assigned ; value = std::move( s.value ); s.state = moved_from; return *this; }
#endif
bool operator==( S const & rhs ) const { return state == rhs.state && value == rhs.value; }
};
inline std::ostream & operator<<( std::ostream & os, V const & v )
{
using lest::to_string;
return os << "[V:" << to_string( v.value ) << "]";
}
inline std::ostream & operator<<( std::ostream & os, S const & s )
{
using lest::to_string;
return os << "[S:" << to_string( s.value ) << "]";
}
struct NoDefault
{
NoDefault( NoDefault const & ) {}
NoDefault & operator=( NoDefault const & ) { return *this; }
#if optional_CPP11_OR_GREATER
NoDefault( NoDefault && ) = default;
NoDefault & operator=( NoDefault && ) = default;
#endif
private:
NoDefault();
};
struct CopyOnly
{
CopyOnly( CopyOnly const & ) {}
CopyOnly & operator=( CopyOnly const & ) { return *this; }
private:
CopyOnly();
#if optional_CPP11_OR_GREATER
CopyOnly( CopyOnly && ) = delete;
CopyOnly & operator=( CopyOnly && ) = delete;
#endif
};
struct MoveOnly
{
#if optional_CPP11_OR_GREATER
MoveOnly( MoveOnly && ) = default;
MoveOnly & operator=( MoveOnly && ) = default;
#endif
private:
MoveOnly();
MoveOnly( MoveOnly const & );
MoveOnly & operator=( MoveOnly const & );
};
struct NoDefaultCopyMove
{
std::string text;
NoDefaultCopyMove( std::string txt ) : text( txt ) {}
private:
NoDefaultCopyMove();
NoDefaultCopyMove( NoDefaultCopyMove const & );
NoDefaultCopyMove & operator=( NoDefaultCopyMove const & );
#if optional_CPP11_OR_GREATER
NoDefaultCopyMove( NoDefaultCopyMove && ) = delete;
NoDefaultCopyMove & operator=( NoDefaultCopyMove && ) = delete;
#endif
};
#if optional_CPP11_OR_GREATER
struct InitList
{
std::vector<int> vec;
char c;
S s;
InitList( std::initializer_list<int> il, char k, S const & t )
: vec( il ), c( k ), s( t ) {}
InitList( std::initializer_list<int> il, char k, S && t )
: vec( il ), c( k ), s( std::move( t ) ) {}
};
#endif
} // anonymous namespace
//
// test specification:
//
CASE( "union: A C++03 union can only contain POD types" )
{
union U
{
char c;
#if optional_CPP11_OR_GREATER
nonpod np;
#endif
};
}
//
// optional member operations:
//
// construction:
CASE( "optional: Allows to default construct an empty optional (1a)" )
{
optional<int> a;
EXPECT( !a );
}
CASE( "optional: Allows to explicitly construct a disengaged, empty optional via nullopt (1b)" )
{
optional<int> a( nullopt );
EXPECT( !a );
}
CASE( "optional: Allows to default construct an empty optional with a non-default-constructible (1a)" )
{
// FAILS: NoDefault nd;
// FAILS: NoDefaultCopyMove ndcm;
optional<NoDefault> ond;
optional<CopyOnly> oco;
optional<MoveOnly> omo;
optional<NoDefaultCopyMove> ondcm;
EXPECT( !ond );
EXPECT( !oco );
EXPECT( !omo );
EXPECT( !ondcm );
}
CASE( "optional: Allows to copy-construct from empty optional (2)" )
{
optional<int> a;
optional<int> b( a );
EXPECT( !b );
}
CASE( "optional: Allows to move-construct from empty optional (C++11, 3)" )
{
#if optional_CPP11_OR_GREATER
optional<int> a;
optional<int> b( std::move( a ) );
EXPECT( !b );
#else
EXPECT( !!"optional: move-construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to copy-construct from empty optional, explicit converting (C++11, 4a)" )
{
#if optional_CPP11_OR_GREATER
optional<int> a;
optional<Explicit> b{ a };
EXPECT( !b );
#else
EXPECT( !!"optional: move-construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to copy-construct from empty optional, non-explicit converting (4b)" )
{
optional<int> a;
optional<Implicit> b( a );
EXPECT( !b );
}
CASE( "optional: Allows to move-construct from empty optional, explicit converting (C++11, 5a)" )
{
#if optional_CPP11_OR_GREATER
optional<int> a;
optional<Explicit> b{ std::move( a ) };
EXPECT( !b );
#else
EXPECT( !!"optional: move-construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to move-construct from empty optional, non-explicit converting (C++11, 5a)" )
{
#if optional_CPP11_OR_GREATER
optional<int> a;
optional<Implicit> b( std::move( a ) );
EXPECT( !b );
#else
EXPECT( !!"optional: move-construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to copy-construct from non-empty optional (2)" )
{
optional<int> a( 7 );
optional<int> b( a );
EXPECT( b );
EXPECT( *b == 7 );
}
CASE( "optional: Allows to copy-construct from non-empty optional, explicit converting (C++11, 4a)" )
{
#if optional_CPP11_OR_GREATER
optional<int> a( 7 );
optional<Explicit> b{ a };
EXPECT( b );
EXPECT( *b == Explicit{7} );
#else
EXPECT( !!"optional: move-construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to copy-construct from non-empty optional, non-explicit converting (4b)" )
{
optional<int> a( 7 );
optional<Implicit> b( a );
EXPECT( b );
EXPECT( *b == Implicit(7) );
}
CASE( "optional: Allows to move-construct from non-empty optional (C++11, 3)" )
{
#if optional_CPP11_OR_GREATER
optional<int> a( 7 );
optional<int> b( std::move( a ) );
EXPECT( b );
EXPECT( *b == 7 );
#else
EXPECT( !!"optional: move-construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to move-construct from non-empty optional, explicit converting (C++11, 5a)" )
{
#if optional_CPP11_OR_GREATER
optional<int> a( 7 );
optional<Explicit> b{ std::move( a ) };
EXPECT( b );
EXPECT( *b == Explicit{7} );
#else
EXPECT( !!"optional: move-construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to move-construct from non-empty optional, non-explicit converting (C++11, 5b)" )
{
#if optional_CPP11_OR_GREATER
optional<int> a( 7 );
optional<Implicit> b( std::move( a ) );
EXPECT( b );
EXPECT( *b == Implicit(7) );
#else
EXPECT( !!"optional: move-construction is not available (no C++11)" );
#endif
}
namespace {
#if optional_CPP11_OR_GREATER
void use_optional( nonstd::optional<Implicit> ) {}
#else
template< typename T >
void use_optional( T ) {}
#endif
}
CASE( "optional: Allows to copy-construct from literal value (8)" )
{
use_optional( 7 );
optional<int> a = 7;
EXPECT( a );
EXPECT( *a == 7 );
}
CASE( "optional: Allows to copy-construct from literal value, converting (8)" )
{
use_optional( '7' );
optional<int> a = '7';
EXPECT( a );
EXPECT( *a == '7' );
}
CASE( "optional: Allows to copy-construct from value (8)" )
{
const int i = 7;
use_optional( i );
optional<int> a( i );
EXPECT( a );
EXPECT( *a == 7 );
}
CASE( "optional: Allows to copy-construct from value, converting (8)" )
{
const char c = '7';
use_optional( c );
optional<int> a( c );
EXPECT( a );
EXPECT( *a == '7' );
}
CASE( "optional: Allows to move-construct from value (C++11, 8b)" )
{
#if optional_CPP11_OR_GREATER
S s( 7 );
optional<S> a( std::move( s ) );
EXPECT( a->value == 7 );
EXPECT( a->state == move_constructed );
EXPECT( s.state == moved_from );
#else
EXPECT( !!"optional: move-construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to move-construct from value, explicit converting (C++11, 8a)" )
{
#if optional_CPP11_OR_GREATER
int seven = 7;
optional<Explicit> a{ std::move( seven ) };
EXPECT( a );
EXPECT( *a == Explicit{7} );
#else
EXPECT( !!"optional: move-construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to move-construct from value, non-explicit converting (C++11, 8b)" )
{
#if optional_CPP11_OR_GREATER
int seven = 7;
optional<Implicit> a( std::move( seven ) );
EXPECT( a );
EXPECT( *a == Implicit(7) );
#else
EXPECT( !!"optional: move-construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to in-place construct an immovable object (C++11, 6" )
{
#if optional_CPP11_OR_GREATER
optional<NoDefaultCopyMove> ondcm( in_place, std::string("test") );
EXPECT( ondcm.has_value() );
#else
EXPECT( !!"optional: in-place construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to in-place construct from literal value (C++11, 6)" )
{
#if optional_CPP11_OR_GREATER
using pair_t = std::pair<char, int>;
optional<pair_t> a( in_place, 'a', 7 );
EXPECT( a->first == 'a' );
EXPECT( a->second == 7 );
#else
EXPECT( !!"optional: in-place construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to in-place construct from literal value (C++11, 6, const)" )
{
#if optional_CPP11_OR_GREATER
using pair_t = std::pair<char, int>;
optional<const pair_t> a( in_place, 'a', 7 );
EXPECT( a->first == 'a' );
EXPECT( a->second == 7 );
#else
EXPECT( !!"optional: in-place construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to in-place copy-construct from value (C++11, 6)" )
{
#if optional_CPP11_OR_GREATER
char c = 'a'; S s( 7 );
using pair_t = std::pair<char, S>;
optional<pair_t> a( in_place, c, s );
EXPECT( a->first == 'a' );
EXPECT( a->second.value == 7 );
EXPECT( a->second.state == copy_constructed );
EXPECT( s.state != moved_from );
#else
EXPECT( !!"optional: in-place construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to in-place copy-construct from value (C++11, 6, const)" )
{
#if optional_CPP11_OR_GREATER
char c = 'a'; S s( 7 );
using pair_t = std::pair<char, S>;
optional<const pair_t> a( in_place, c, s );
EXPECT( a->first == 'a' );
EXPECT( a->second.value == 7 );
EXPECT( a->second.state == copy_constructed );
EXPECT( s.state != moved_from );
#else
EXPECT( !!"optional: in-place construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to in-place move-construct from value (C++11, 6)" )
{
#if optional_CPP11_OR_GREATER
char c = 'a'; S s( 7 );
using pair_t = std::pair<char, S>;
optional<pair_t> a( in_place, c, std::move( s ) );
EXPECT( a->first == 'a' );
EXPECT( a->second.value == 7 );
EXPECT( a->second.state == move_constructed );
EXPECT( s.state == moved_from );
#else
EXPECT( !!"optional: in-place construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to in-place copy-construct from initializer-list (C++11, 7)" )
{
#if optional_CPP11_OR_GREATER
S s( 7 );
optional<InitList> a( in_place, { 7, 8, 9, }, 'a', s );
EXPECT( a->vec[0] == 7 );
EXPECT( a->vec[1] == 8 );
EXPECT( a->vec[2] == 9 );
EXPECT( a->c == 'a');
EXPECT( a->s.value == 7 );
#if optional_USES_STD_OPTIONAL
EXPECT( a->s.state == copy_constructed );
#else
EXPECT( a->s.state == move_constructed );
#endif
EXPECT( s.state != moved_from );
#else
EXPECT( !!"optional: in-place construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to in-place copy-construct from initializer-list (C++11, 7, const)" )
{
#if optional_CPP11_OR_GREATER
S s( 7 );
optional<const InitList> a( in_place, { 7, 8, 9, }, 'a', s );
EXPECT( a->vec[0] == 7 );
EXPECT( a->vec[1] == 8 );
EXPECT( a->vec[2] == 9 );
EXPECT( a->c == 'a');
EXPECT( a->s.value == 7 );
EXPECT( a->s.state == copy_constructed );
EXPECT( s.state != moved_from );
#else
EXPECT( !!"optional: in-place construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to in-place move-construct from initializer-list (C++11, 7)" )
{
#if optional_CPP11_OR_GREATER
S s( 7 );
optional<InitList> a( in_place, { 7, 8, 9, }, 'a', std::move( s ) );
EXPECT( a->vec[0] == 7 );
EXPECT( a->vec[1] == 8 );
EXPECT( a->vec[2] == 9 );
EXPECT( a->c == 'a' );
EXPECT( a->s.value == 7 );
EXPECT( a->s.state == move_constructed );
EXPECT( s.state == moved_from );
#else
EXPECT( !!"optional: in-place construction is not available (no C++11)" );
#endif
}
// assignment:
CASE( "optional: Allows to assign nullopt to disengage (1)" )
{
optional<int> a( 7 );
a = nullopt;
EXPECT( !a );
}
CASE( "optional: Allows to copy-assign from/to engaged and disengaged optionals (2)" )
{
SETUP( "" ) {
optional<int> d1;
optional<int> d2;
optional<int> e1( 123 );
optional<int> e2( 987 );
SECTION( "a disengaged optional assigned nullopt remains empty" ) {
d1 = nullopt;
EXPECT( !d1 );
}
SECTION( "a disengaged optional assigned an engaged optional obtains its value" ) {
d1 = e1;
EXPECT( d1 );
EXPECT( *d1 == 123 );
}
SECTION( "an engaged optional assigned an engaged optional obtains its value" ) {
e1 = e2;
EXPECT( e1 );
EXPECT( *e1 == 987 );
}
SECTION( "an engaged optional assigned nullopt becomes empty" ) {
e1 = nullopt;
EXPECT( !e1 );
}
SECTION( "a disengaged optional assigned a disengaged optional remains empty" ) {
d1 = d2;
EXPECT( !d1 );
}}
}
CASE( "optional: Allows to move-assign from/to engaged and disengaged optionals (C++11, 3)" )
{
#if optional_CPP11_OR_GREATER
SETUP( "" ) {
optional<int> d1;
optional<int> d2;
optional<int> e1( 123 );
optional<int> e2( 987 );
SECTION( "a disengaged optional assigned nullopt remains empty" ) {
d1 = std::move( nullopt );
EXPECT( !d1 );
}
SECTION( "a disengaged optional assigned an engaged optional obtains its value" ) {
d1 = std::move( e1);
EXPECT( d1 );
EXPECT( *d1 == 123 );
}
SECTION( "an engaged optional assigned an engaged optional obtains its value" ) {
e1 = std::move( e2 );
EXPECT( e1 );
EXPECT( *e1 == 987 );
}
SECTION( "an engaged optional assigned nullopt becomes empty" ) {
e1 = std::move( nullopt );
EXPECT( !e1 );
}
SECTION( "a disengaged optional assigned a disengaged optional remains empty" ) {
d1 = std::move( d2);
EXPECT( !d1 );
}}
#else
EXPECT( !!"optional: move-assignment is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to copy-assign from/to engaged and disengaged optionals, converting, (5)" )
{
SETUP( "" ) {
optional<int> d1;
optional<char> d2;
optional<int> e1( 123 );
optional<char> e2( '7' );
SECTION( "a disengaged optional assigned an engaged optional obtains its value, converting" ) {
d1 = e2;
EXPECT( d1 );
EXPECT( *d1 == '7' );
}
SECTION( "an engaged optional assigned an engaged optional obtains its value, converting" ) {
e1 = e2;
EXPECT( e1 );
EXPECT( *e1 == '7' );
}
SECTION( "an engaged optional assigned a disengaged optional becomes empty, converting" ) {
e1 = d2;
EXPECT( !e1 );
}
SECTION( "a disengaged optional assigned a disengaged optional remains empty, converting" ) {
d1 = d2;
EXPECT( !d1 );
}}
}
CASE( "optional: Allows to move-assign from/to engaged and disengaged optionals, converting (C++11, 6)" )
{
#if optional_CPP11_OR_GREATER
SETUP( "" ) {
optional<int> d1;
optional<char> d2;
optional<int> e1( 123 );
optional<char> e2( '7' );
SECTION( "a disengaged optional assigned an engaged optional obtains its value, converting" ) {
d1 = std::move( e2 );
EXPECT( d1 );
EXPECT( *d1 == '7' );
}
SECTION( "an engaged optional assigned an engaged optional obtains its value, converting" ) {
e1 = std::move( e2 );
EXPECT( e1 );
EXPECT( *e1 == '7' );
}
SECTION( "an engaged optional assigned a disengaged optional becomes empty, converting" ) {
e1 = std::move( d2 );
EXPECT( !e1 );
}
SECTION( "a disengaged optional assigned a disengaged optional remains empty, converting" ) {
d1 = std::move( d2 );
EXPECT( !d1 );
}}
#else
EXPECT( !!"optional: move-assignment is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to copy-assign from literal value (4)" )
{
optional<int> a;
a = 7;
EXPECT( *a == 7 );
}
CASE( "optional: Allows to copy-assign from value (4)" )
{
const int i = 7;
optional<int> a;
a = i;
EXPECT( *a == i );
}
CASE( "optional: Allows to move-assign from value (C++11, 4)" )
{
#if optional_CPP11_OR_GREATER
S s( 7 );
optional<S> a;
a = std::move( s );
EXPECT( a->value == 7 );
EXPECT( a->state == move_constructed );
EXPECT( s.state == moved_from );
#else
EXPECT( !!"optional: move-assign is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to copy-emplace content from arguments (C++11, 7)" )
{
#if optional_CPP11_OR_GREATER
using pair_t = std::pair<char, S>;
S s( 7 );
optional<pair_t> a;
a.emplace( 'a', s );
EXPECT( a->first == 'a' );
EXPECT( a->second.value == 7 );
EXPECT( a->second.state == copy_constructed );
EXPECT( s.state != moved_from );
#else
EXPECT( !!"optional: in-place construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to copy-emplace content from arguments (C++11, 7, const)" )
{
#if optional_CPP11_OR_GREATER
using pair_t = std::pair<char, S>;
S s( 7 );
optional<const pair_t> a;
a.emplace( 'a', s );
EXPECT( a->first == 'a' );
EXPECT( a->second.value == 7 );
EXPECT( a->second.state == copy_constructed );
EXPECT( s.state != moved_from );
#else
EXPECT( !!"optional: in-place construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to move-emplace content from arguments (C++11, 7)" )
{
#if optional_CPP11_OR_GREATER
using pair_t = std::pair<char, S>;
S s( 7 );
optional<pair_t> a;
a.emplace( 'a', std::move( s ) );
EXPECT( a->first == 'a' );
EXPECT( a->second.value == 7 );
EXPECT( a->second.state == move_constructed );
EXPECT( s.state == moved_from );
#else
EXPECT( !!"optional: in-place construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to copy-emplace content from intializer-list and arguments (C++11, 8)" )
{
#if optional_CPP11_OR_GREATER
S s( 7 );
optional<InitList> a;
a.emplace( { 7, 8, 9, }, 'a', s );
EXPECT( a->vec[0] == 7 );
EXPECT( a->vec[1] == 8 );
EXPECT( a->vec[2] == 9 );
EXPECT( a->c == 'a' );
EXPECT( a->s.value == 7 );
EXPECT( a->s.state == copy_constructed );
EXPECT( s.state != moved_from );
#else
EXPECT( !!"optional: in-place construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to copy-emplace content from intializer-list and arguments (C++11, 8, const)" )
{
#if optional_CPP11_OR_GREATER
S s( 7 );
optional<const InitList> a;
a.emplace( { 7, 8, 9, }, 'a', s );
EXPECT( a->vec[0] == 7 );
EXPECT( a->vec[1] == 8 );
EXPECT( a->vec[2] == 9 );
EXPECT( a->c == 'a' );
EXPECT( a->s.value == 7 );
EXPECT( a->s.state == copy_constructed );
EXPECT( s.state != moved_from );
#else
EXPECT( !!"optional: in-place construction is not available (no C++11)" );
#endif
}
CASE( "optional: Allows to move-emplace content from intializer-list and arguments (C++11, 8)" )
{
#if optional_CPP11_OR_GREATER
S s( 7 );
optional<InitList> a;
a.emplace( { 7, 8, 9, }, 'a', std::move( s ) );
EXPECT( a->vec[0] == 7 );
EXPECT( a->vec[1] == 8 );
EXPECT( a->vec[2] == 9 );
EXPECT( a->c == 'a' );
EXPECT( a->s.value == 7 );
EXPECT( a->s.state == move_constructed );
EXPECT( s.state == moved_from );
#else
EXPECT( !!"optional: in-place construction is not available (no C++11)" );
#endif
}
// swap:
CASE( "optional: Allows to swap with other optional (member)" )
{
SETUP( "" ) {
optional<int> d1;
optional<int> d2;
optional<int> e1( 42 );
optional<int> e2( 7 );
SECTION( "swap disengaged with disengaged optional" ) {
d1.swap( d2 );
EXPECT( !d1 );
}
SECTION( "swap engaged with engaged optional" ) {
e1.swap( e2 );
EXPECT( e1 );
EXPECT( e2 );
EXPECT( *e1 == 7 );
EXPECT( *e2 == 42 );
}
SECTION( "swap disengaged with engaged optional" ) {
d1.swap( e1 );
EXPECT( d1 );
EXPECT( !e1 );
EXPECT( *d1 == 42 );
}
SECTION( "swap engaged with disengaged optional" ) {
e1.swap( d1 );
EXPECT( d1 );
EXPECT( !e1 );
EXPECT( *d1 == 42 );
}}
}
// observers:
CASE( "optional: Allows to obtain value via operator->()" )
{
SETUP( "" ) {
optional<Implicit> e( Implicit( 42 ) );
optional<Implicit> const ce( Implicit( 42 ) );
SECTION( "operator->() yields pointer to value (const)" ) {
EXPECT( ce->x == 42 );
}
SECTION( "operator->() yields pointer to value (non-const)" ) {
e->x = 7;
EXPECT( e->x == 7 );
}}
}
CASE( "optional: Allows to obtain moved-value via operator->() (C++11)" )
{
#if optional_CPP11_OR_GREATER
SETUP( "" ) {
optional<Implicit> e( Implicit( 42 ) );
optional<Implicit> const ce( Implicit( 42 ) );
SECTION( "operator->() yields pointer to value (const)" ) {
EXPECT( std::move( ce )->x == 42 );
}
SECTION( "operator->() yields pointer to value (non-const)" ) {
e->x = 7;
EXPECT( std::move( e )->x == 7 );
}}
#else
EXPECT( !!"optional: move-semantics are not available (no C++11)" );
#endif
}
CASE( "optional: Allows to obtain value via operator*()" )
{
SETUP( "" ) {
optional<int> e( 42 );
optional<int> const ce( 42 );
SECTION( "operator*() yields value (const)" ) {
EXPECT( *ce == 42 );
}
SECTION( "operator*() yields value (non-const)" ) {
*e = 7;
EXPECT( *e == 7 );
}}
}
CASE( "optional: Allows to obtain moved-value via operator*() (C++11)" )
{
#if optional_CPP11_OR_GREATER
SETUP( "" ) {
optional<int> e( 42 );
optional<int> const ce( 42 );
SECTION( "operator*() yields value (const)" ) {
EXPECT( *(std::move( ce )) == 42 );
}
SECTION( "operator*() yields value (non-const)" ) {
*e = 7;
EXPECT( *(std::move( e )) == 7 );
}}