Add <boost/system/result.hpp>

2021-09-16 18:47:05 +03:00
parent 6156076dab
commit fd852c675e
13 changed files with 2864 additions and 1 deletions
@@ -0,0 +1,259 @@
+// Copyright 2017, 2021 Peter Dimov.
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/result/result.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/core/lightweight_test_trait.hpp>
+
+using namespace boost::result;
+
+struct X
+{
+    int v_;
+
+    explicit X( int v ): v_( v ) {}
+
+    X( X const& ) = delete;
+    X& operator=( X const& ) = delete;
+};
+
+struct Y
+{
+};
+
+struct E
+{
+};
+
+BOOST_NORETURN void throw_exception_from_error_code( Y const & )
+{
+    throw E();
+}
+
+int main()
+{
+    {
+        result<int> r;
+
+        BOOST_TEST( r.has_value() );
+        BOOST_TEST( !r.has_error() );
+
+        BOOST_TEST( r );
+        BOOST_TEST_NOT( !r );
+
+        BOOST_TEST_EQ( r.value(), 0 );
+        BOOST_TEST_EQ( *r, 0 );
+
+        BOOST_TEST_EQ( r.operator->(), &*r );
+    }
+
+    {
+        result<int> const r;
+
+        BOOST_TEST( r.has_value() );
+        BOOST_TEST( !r.has_error() );
+
+        BOOST_TEST( r );
+        BOOST_TEST_NOT( !r );
+
+        BOOST_TEST_EQ( r.value(), 0 );
+        BOOST_TEST_EQ( *r, 0 );
+
+        BOOST_TEST_EQ( r.operator->(), &*r );
+    }
+
+    {
+        BOOST_TEST( result<int>().has_value() );
+        BOOST_TEST( !result<int>().has_error() );
+
+        BOOST_TEST( result<int>() );
+        BOOST_TEST_NOT( !result<int>() );
+
+        BOOST_TEST_EQ( result<int>().value(), 0 );
+        BOOST_TEST_EQ( *result<int>(), 0 );
+
+        BOOST_TEST( result<int>().operator->() != 0 );
+    }
+
+    {
+        result<int> r( 1 );
+
+        BOOST_TEST( r.has_value() );
+        BOOST_TEST( !r.has_error() );
+
+        BOOST_TEST( r );
+        BOOST_TEST_NOT( !r );
+
+        BOOST_TEST_EQ( r.value(), 1 );
+        BOOST_TEST_EQ( *r, 1 );
+
+        BOOST_TEST_EQ( r.operator->(), &*r );
+    }
+
+    {
+        result<int> const r( 1 );
+
+        BOOST_TEST( r.has_value() );
+        BOOST_TEST( !r.has_error() );
+
+        BOOST_TEST( r );
+        BOOST_TEST_NOT( !r );
+
+        BOOST_TEST_EQ( r.value(), 1 );
+        BOOST_TEST_EQ( *r, 1 );
+
+        BOOST_TEST_EQ( r.operator->(), &*r );
+    }
+
+    {
+        BOOST_TEST( result<int>( 1 ).has_value() );
+        BOOST_TEST( !result<int>( 1 ).has_error() );
+
+        BOOST_TEST( result<int>( 1 ) );
+        BOOST_TEST_NOT( !result<int>( 1 ) );
+
+        BOOST_TEST_EQ( result<int>( 1 ).value(), 1 );
+        BOOST_TEST_EQ( *result<int>( 1 ), 1 );
+
+        BOOST_TEST( result<int>( 1 ).operator->() != 0 );
+    }
+
+    {
+        auto ec = make_error_code( std::errc::invalid_argument );
+
+        result<int> r( ec );
+
+        BOOST_TEST( !r.has_value() );
+        BOOST_TEST( r.has_error() );
+
+        BOOST_TEST_NOT( r );
+        BOOST_TEST( !r );
+
+        BOOST_TEST_THROWS( r.value(), std::system_error );
+
+        BOOST_TEST_EQ( r.operator->(), static_cast<int*>(0) );
+    }
+
+    {
+        auto ec = make_error_code( std::errc::invalid_argument );
+
+        result<int> const r( ec );
+
+        BOOST_TEST( !r.has_value() );
+        BOOST_TEST( r.has_error() );
+
+        BOOST_TEST_NOT( r );
+        BOOST_TEST( !r );
+
+        BOOST_TEST_THROWS( r.value(), std::system_error );
+
+        BOOST_TEST_EQ( r.operator->(), static_cast<int*>(0) );
+    }
+
+    {
+        auto ec = make_error_code( std::errc::invalid_argument );
+
+        BOOST_TEST( !result<int>( ec ).has_value() );
+        BOOST_TEST( result<int>( ec ).has_error() );
+
+        BOOST_TEST_NOT( result<int>( ec ) );
+        BOOST_TEST( !result<int>( ec ) );
+
+        BOOST_TEST_THROWS( result<int>( ec ).value(), std::system_error );
+
+        BOOST_TEST_EQ( result<int>( ec ).operator->(), static_cast<int*>(0) );
+    }
+
+    {
+        result<X> r( 1 );
+
+        BOOST_TEST( r.has_value() );
+        BOOST_TEST( !r.has_error() );
+
+        BOOST_TEST( r );
+        BOOST_TEST_NOT( !r );
+
+        BOOST_TEST_EQ( r.value().v_, 1 );
+        BOOST_TEST_EQ( (*r).v_, 1 );
+        BOOST_TEST_EQ( r->v_, 1 );
+
+        BOOST_TEST_EQ( r.operator->(), &*r );
+    }
+
+    {
+        result<X> const r( 1 );
+
+        BOOST_TEST( r.has_value() );
+        BOOST_TEST( !r.has_error() );
+
+        BOOST_TEST( r );
+        BOOST_TEST_NOT( !r );
+
+        BOOST_TEST_EQ( r.value().v_, 1 );
+        BOOST_TEST_EQ( (*r).v_, 1 );
+        BOOST_TEST_EQ( r->v_, 1 );
+
+        BOOST_TEST_EQ( r.operator->(), &*r );
+    }
+
+    {
+        BOOST_TEST( result<X>( 1 ).has_value() );
+        BOOST_TEST( !result<X>( 1 ).has_error() );
+
+        BOOST_TEST( result<X>( 1 ) );
+        BOOST_TEST_NOT( !result<X>( 1 ) );
+
+        BOOST_TEST_EQ( result<X>( 1 ).value().v_, 1 );
+        BOOST_TEST_EQ( (*result<X>( 1 )).v_, 1 );
+        BOOST_TEST_EQ( result<X>( 1 )->v_, 1 );
+    }
+
+    {
+        auto ec = Y();
+
+        result<X, Y> r( ec );
+
+        BOOST_TEST( !r.has_value() );
+        BOOST_TEST( r.has_error() );
+
+        BOOST_TEST_NOT( r );
+        BOOST_TEST( !r );
+
+        BOOST_TEST_THROWS( r.value(), E );
+
+        BOOST_TEST_EQ( r.operator->(), static_cast<X*>(0) );
+    }
+
+    {
+        auto ec = Y();
+
+        result<X, Y> const r( ec );
+
+        BOOST_TEST( !r.has_value() );
+        BOOST_TEST( r.has_error() );
+
+        BOOST_TEST_NOT( r );
+        BOOST_TEST( !r );
+
+        BOOST_TEST_THROWS( r.value(), E );
+
+        BOOST_TEST_EQ( r.operator->(), static_cast<X*>(0) );
+    }
+
+    {
+        auto ec = Y();
+
+        BOOST_TEST(( !result<X, Y>( ec ).has_value() ));
+        BOOST_TEST(( result<X, Y>( ec ).has_error() ));
+
+        BOOST_TEST_NOT(( result<X, Y>( ec ) ));
+        BOOST_TEST(( !result<X, Y>( ec ) ));
+
+        BOOST_TEST_THROWS( (result<X, Y>( ec ).value()), E );
+
+        BOOST_TEST_EQ( (result<X, Y>( ec ).operator->()), static_cast<X*>(0) );
+    }
+
+    return boost::report_errors();
+}