templates to existing code • Part II: Overload resolution and ADL • Part III: Conditions at compile time pre C++20 • Part IV: Conditions at compile time using C++20 (and beyond…) • Part V: Advanced methods for Error). • We will get an error if we try to call a function with no viable candidates.PART III: CONDITIONS AT COMPILE TIME PRE C++20 18: • type_traits are part of library. • Verified type trait (since C++20): • A constexpr function. • Identifies a situation. 19 PART III: CONDITIONS AT COMPILE TIME PRE C++20: overview • Classes: • Queries • Helper classes (is constant)

guest operating systems, even on 32-bit host operating systems,2 pro- vided that the following conditions are met: 1. You need a 64-bit processor with hardware virtualization support (see chapter 10.3 version 4.0, VirtualBox shared folders also support symbolic links (symlinks), under the following conditions: 1. The host operating system must support symlinks (i.e. a Mac, Linux or Solaris host is required) driver on the Marvell Yukon II EC Ultra Ethernet NIC is known to cause packet losses under certain conditions. 2For Mac OS X and Solaris hosts, net filter drivers were already added in VirtualBox 2.0 (as initial

guest operating systems, even on 32-bit host operating systems,2 pro- vided that the following conditions are met: 1. You need a 64-bit processor with hardware virtualization support (see chapter 10.3 version 4.0, VirtualBox shared folders also support symbolic links (symlinks), under the following conditions: 1. The host operating system must support symlinks (i.e. a Mac, Linux or Solaris host is required) driver on the Marvell Yukon II EC Ultra Ethernet NIC is known to cause packet losses under certain conditions. 2For Mac OS X and Solaris hosts, net filter drivers were already added in VirtualBox 2.0 (as initial

guest operating systems, even on 32-bit host operating systems,2 pro- vided that the following conditions are met: 1. You need a 64-bit processor with hardware virtualization support (see chapter 10.3 version 4.0, VirtualBox shared folders also support symbolic links (symlinks), under the following conditions: 1. The host operating system must support symlinks (i.e. a Mac, Linux or Solaris host is required) driver on the Marvell Yukon II EC Ultra Ethernet NIC is known to cause packet losses under certain conditions. Some adapters strip VLAN tags in hardware. This does not allow to use VLAN trunking be- tween

guest operating systems, even on 32-bit host operating systems,2 pro- vided that the following conditions are met: 1. You need a 64-bit processor with hardware virtualization support (see chapter 10.3 version 4.0, VirtualBox shared folders also support symbolic links (symlinks), under the following conditions: 1. The host operating system must support symlinks (i.e. a Mac, Linux or Solaris host is required) driver on the Marvell Yukon II EC Ultra Ethernet NIC is known to cause packet losses under certain conditions. Some adapters strip VLAN tags in hardware. This does not allow to use VLAN trunking be- tween

guest operating systems, even on 32-bit host operating systems,2 pro- vided that the following conditions are met: 1. You need a 64-bit processor with hardware virtualization support (see chapter 10.3 version 4.0, VirtualBox shared folders also support symbolic links (symlinks), under the following conditions: 1. The host operating system must support symlinks (i.e. a Mac, Linux or Solaris host is required) driver on the Marvell Yukon II EC Ultra Ethernet NIC is known to cause packet losses under certain conditions. 2For Mac OS X and Solaris hosts, net filter drivers were already added in VirtualBox 2.0 (as initial

locking mechanisms are designed for shared resources • They don’t handle waiting for combinatorial conditions well • Could use a scoped lock or latch/barrier, but need application of DeMorgan’s theorem mutex … std::scoped_lock joint_lock(lock[1], lock[2]); // Simple enough … // Now let’s lock on 10 conditions std::scoped_lock wide_lock(lock[0], lock[1], lock[2], lock[3], lock[4], lock[5], lock[6], lock[7] List conditions = {cond0, … , condN}; … // Variatic Argument Approach co_await concurrencpp::when_all(cond0, cond1, cond2); … // Iterator approach co_await concurrencpp::when_all(conditions.begin, conditions

useful pattern because it allows us to compose structure directly without conditions in the handling code without conditions in the handling code.. We We don't have a dichotomy don't have a dichotomy have don't have to put to put conditions conditions in the calling code. in the calling code.HERE'S THE LEARNING HERE'S THE LEARNING No raw conditions No raw conditions.. A A raw condition raw condition (For the rest of it.) I suggest watching that talk again. (For the rest of it.)NO RAW CONDITIONS NO RAW CONDITIONS Put another way - Put another way - We should strive to put We should strive to put

Coprocessor (PROCESSED_KEYS �→ ) and request units (RU) as identifying �→ conditions, and puts identified queries into the specified resource �→ group for more precise identification queries, avoiding identification bias when overall performance decreases. You can set multiple conditions simultaneously, and a query is identified as a runaway query if any condition is met. You can performance when querying tables with numerous columns #52112 @Rustin170506 85 • Simplify filter conditions like a = 1 AND (a > 1 OR (a = 1 AND b = 2)) to a �→ = 1 AND b = 2 #56005 @ghazalfamilyusa • Increase

Coprocessor (PROCESSED_KEYS �→ ) and request units (RU) as identifying �→ conditions, and puts identified queries into the specified resource �→ group for more precise identification queries, avoiding identification bias when overall performance decreases. You can set multiple conditions simultaneously, and a query is identified as a runaway query if any condition is met. You can performance when querying tables with numerous columns #52112 @Rustin170506 80 • Simplify filter conditions like a = 1 AND (a > 1 OR (a = 1 AND b = 2)) to a �→ = 1 AND b = 2 #56005 @ghazalfamilyusa • Increase