a society that honors the servant and has forgotten the gi�. 363738Add simple debug handler namespace async_trace { template async::injected_debug_handler<> = async_trace::debug_handler{}; 15 39Add simple debug handler namespace async_trace { template template <> 14 inline auto async::injected_debug_handler<> = async_trace::debug_handler{}; 15 namespace async_trace { struct debug_handler { template

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no declarations only preprocessor directives exported "exportedness" applies to names not a namespace separate name 'domain'MODULE TU TYPES & FEATURES Interface unit ✅ ✅ ✅ ❎ ✅ ✅ ✅ Implementation unit answer = 42; }; export namespace SimpleModule { void f(const detail &); std::vector g(); } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 module SimpleModule; namespace SimpleModule { void something with D } } 1 2 3 4 5 6 7 8 9 module; #include module SimpleModule; namespace SimpleModule { std::vector g() { return {{ 42 }, { 43 }}; } } 1 2 3 4 5 6 7 8 9

objects, views of data - Algorithms - Operate on and modify data using namespace std; using namespace std::ranges; using namespace std::execution; template auto dot_product(R&& x, R&& y) { objects, views of data - Algorithms - Operate on and modify data using namespace std; using namespace std::ranges; using namespace std::execution; template auto dot_product(R&& x, R&& y) { concepts - Extensible: execution policies allow parallel execution using namespace std; using namespace std::ranges; using namespace std::execution; template auto dot_product(R&& x, R&& y) {

forward (e.g., class C;) declara`on. • Defined right away: � Any type aliases (typedef/using) or namespace names. • Never defined, only declared: � Names of en``es (e.g., std::declval) intended for use binding, func`on, enumerator, type, class member, bit-field, template, template specializa`on, namespace, or pack.” • “A name is a use of an iden*fier, operator-func*on-id, literal-operator-id, conversion-func*on-id someCmes reserved: � Each iden`fier that begins with an underscore is reserved … in the global namespace.” � final, import, module, and override “have a special meaning when appearing in a certain context

Constructors & Destructors (3)50 When lifetime starts?51 When lifetime starts and finishes?52 using namespace std; struct Foo { Foo(int i) : m_i(i) { cout << "Foo(" << m_i << ")" << endl; } ~Foo() { cout Foo(4); } https://godbolt.org/z/4WroY5311 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1653 using namespace std; struct Foo { Foo(int i) : m_i(i) { cout << "Foo(" << m_i << ")" << endl; } ~Foo() { cout Foo(4); } https://godbolt.org/z/4WroY5311 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1654 using namespace std; struct Foo { Foo(int i) : m_i(i) { cout << "Foo(" << m_i << ")" << endl; } ~Foo() { cout

Lookup(Un-)Qualified Name Lookup 16 void f( double ); // (1) namespace N1 { void f( int ); // (2) } // namespace N1 int main() { } // Unqualified lookup; calls (1) // Unqualified f( 42 ); N1::f( 42 );(Un-)Qualified Name Lookup 17 void f( double ); // (1) namespace N1 { } // namespace N1 int main() { } // Unqualified lookup; calls (1) // Unqualified lookup; calls Lookup 18 void f( double ); // (1) namespace N1 { void f( int ); // (2) void g() { N1::f( 1.0 ); } void h() { f( 1.0 ); } } // namespace N1 int main() { } // Unqualified

tp:: for example code ○ unless defined on the slide ●hello, units using namespace mp_units::si::unit_symbols; using namespace mp_units::international::unit_symbols; constexpr quantity v1 = 110 * (km frequency (Hz)Musical tempo …MIDI example (demo)https://ericjknapp.com/2019/09/26/midi-measures/namespace ni { inline constexpr struct BeatCount : quantity_spec {} QuarterNote; inline constexpr struct WholeNote : named_unit<"w", mag<4> * QuarterNote> {} WholeNote; }namespace ni { inline constexpr struct BeatCount : quantity_spec {}

BY 4.0) 17Namespaces for literals ■ UDL operators are looked up using ordinary name lookup, no namespace qualifiers allowed. ■ To avoid collisions between similar UDL suffixes, UDL operators are usually 4.0) 18 namespace temperature_literals { constexpr Temperature operator""_deg(long double); } namespace geometry_literals { constexpr double operator""_deg(long double); } using namespace geometry_literals; library are in an inline sub-namespace of the inline namespace, std::literals; they must be imported into the current scope by means of a using directive: – using namespace std; imports everything in

1Custom Views for the Rest of Us — Jacob Rice jacob.rice.cpp@gmail.com 2🎉🎆🎊 using namespace std::views; for (int i : iota(2) | filter(even) | transform(square)) std::cout << i << ' '; 1 std::plus<>{}, singleForceOnThisBody); 15 } 16 12131415What is a view? 17Easy to access: namespace std { namespace views = ranges::views; } 1 2 3 18Range View Semantically: a collection of "things" iota iota(2) | ) | filter filter(even) | (even) | transform transform(square)) (square)) using namespace std::views; 1 2 std::cout << i << ' '; 3 21Range Adaptor Range Factory A view that takes

function it is.  For example, a non-member function’s signature also includes its enclosing namespace, if any.  A class member function’s signature also includes:  the class  cv-qualifiers (constand definition of the same class.  namespace scope: outside of any function, class, structure, or union, whether global or in some other namespace  A name declared at namespace scope is in scope to the end for unqualified names.  Lookup for qualified names is fairly simple:  For S::n, where S is a namespace:  Look for n in S.  For T::n, where T is a class type, or  for x.n, where xis a Tobject, or