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-rw-r--r--test/std/utilities/optional/optional.object/optional.object.assign/emplace.pass.cpp64
1 files changed, 47 insertions, 17 deletions
diff --git a/test/std/utilities/optional/optional.object/optional.object.assign/emplace.pass.cpp b/test/std/utilities/optional/optional.object/optional.object.assign/emplace.pass.cpp
index b5362589963c..0696c11526d5 100644
--- a/test/std/utilities/optional/optional.object/optional.object.assign/emplace.pass.cpp
+++ b/test/std/utilities/optional/optional.object/optional.object.assign/emplace.pass.cpp
@@ -10,7 +10,7 @@
// UNSUPPORTED: c++98, c++03, c++11, c++14
// <optional>
-// template <class... Args> void optional<T>::emplace(Args&&... args);
+// template <class... Args> T& optional<T>::emplace(Args&&... args);
#include <optional>
#include <type_traits>
@@ -51,27 +51,35 @@ void test_one_arg() {
using Opt = std::optional<T>;
{
Opt opt;
- opt.emplace();
+ auto & v = opt.emplace();
+ static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(static_cast<bool>(opt) == true);
assert(*opt == T(0));
+ assert(&v == &*opt);
}
{
Opt opt;
- opt.emplace(1);
+ auto & v = opt.emplace(1);
+ static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(static_cast<bool>(opt) == true);
assert(*opt == T(1));
+ assert(&v == &*opt);
}
{
Opt opt(2);
- opt.emplace();
+ auto & v = opt.emplace();
+ static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(static_cast<bool>(opt) == true);
assert(*opt == T(0));
+ assert(&v == &*opt);
}
{
Opt opt(2);
- opt.emplace(1);
+ auto & v = opt.emplace(1);
+ static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(static_cast<bool>(opt) == true);
assert(*opt == T(1));
+ assert(&v == &*opt);
}
}
@@ -83,20 +91,26 @@ void test_multi_arg()
using Opt = std::optional<T>;
{
Opt opt;
- opt.emplace(101, 41);
+ auto &v = opt.emplace(101, 41);
+ static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(static_cast<bool>(opt) == true);
+ assert( v == T(101, 41));
assert(*opt == T(101, 41));
}
{
Opt opt;
- opt.emplace({1, 2, 3, 4});
+ auto &v = opt.emplace({1, 2, 3, 4});
+ static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(static_cast<bool>(opt) == true);
- assert(*opt == T(4)); // T sets its value to the size of the init list
+ assert( v == T(4)); // T sets its value to the size of the init list
+ assert(*opt == T(4));
}
{
Opt opt;
- opt.emplace({1, 2, 3, 4, 5}, 6);
+ auto &v = opt.emplace({1, 2, 3, 4, 5}, 6);
+ static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(static_cast<bool>(opt) == true);
+ assert( v == T(5)); // T sets its value to the size of the init list
assert(*opt == T(5)); // T sets its value to the size of the init list
}
}
@@ -109,73 +123,87 @@ void test_on_test_type() {
assert(T::alive == 0);
{
T::reset_constructors();
- opt.emplace();
+ auto &v = opt.emplace();
+ static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(T::alive == 1);
assert(T::constructed == 1);
assert(T::default_constructed == 1);
assert(T::destroyed == 0);
assert(static_cast<bool>(opt) == true);
assert(*opt == T());
+ assert(&v == &*opt);
}
{
T::reset_constructors();
- opt.emplace();
+ auto &v = opt.emplace();
+ static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(T::alive == 1);
assert(T::constructed == 1);
assert(T::default_constructed == 1);
assert(T::destroyed == 1);
assert(static_cast<bool>(opt) == true);
assert(*opt == T());
+ assert(&v == &*opt);
}
{
T::reset_constructors();
- opt.emplace(101);
+ auto &v = opt.emplace(101);
+ static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(T::alive == 1);
assert(T::constructed == 1);
assert(T::value_constructed == 1);
assert(T::destroyed == 1);
assert(static_cast<bool>(opt) == true);
assert(*opt == T(101));
+ assert(&v == &*opt);
}
{
T::reset_constructors();
- opt.emplace(-10, 99);
+ auto &v = opt.emplace(-10, 99);
+ static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(T::alive == 1);
assert(T::constructed == 1);
assert(T::value_constructed == 1);
assert(T::destroyed == 1);
assert(static_cast<bool>(opt) == true);
assert(*opt == T(-10, 99));
+ assert(&v == &*opt);
}
{
T::reset_constructors();
- opt.emplace(-10, 99);
+ auto &v = opt.emplace(-10, 99);
+ static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(T::alive == 1);
assert(T::constructed == 1);
assert(T::value_constructed == 1);
assert(T::destroyed == 1);
assert(static_cast<bool>(opt) == true);
assert(*opt == T(-10, 99));
+ assert(&v == &*opt);
}
{
T::reset_constructors();
- opt.emplace({-10, 99, 42, 1});
+ auto &v = opt.emplace({-10, 99, 42, 1});
+ static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(T::alive == 1);
assert(T::constructed == 1);
assert(T::value_constructed == 1);
assert(T::destroyed == 1);
assert(static_cast<bool>(opt) == true);
assert(*opt == T(4)); // size of the initializer list
+ assert(&v == &*opt);
}
{
T::reset_constructors();
- opt.emplace({-10, 99, 42, 1}, 42);
+ auto &v = opt.emplace({-10, 99, 42, 1}, 42);
+ static_assert( std::is_same_v<T&, decltype(v)>, "" );
assert(T::alive == 1);
assert(T::constructed == 1);
assert(T::value_constructed == 1);
assert(T::destroyed == 1);
assert(static_cast<bool>(opt) == true);
assert(*opt == T(4)); // size of the initializer list
+ assert(&v == &*opt);
}
}
@@ -210,8 +238,10 @@ int main()
}
{
optional<const int> opt;
- opt.emplace(42);
+ auto &v = opt.emplace(42);
+ static_assert( std::is_same_v<const int&, decltype(v)>, "" );
assert(*opt == 42);
+ assert( v == 42);
opt.emplace();
assert(*opt == 0);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-26 07:51:31 +0000