* data_; }; ## What if? { String s{"User Constructed"; // ... } ## Simple String - Destructor struct SString { // ... ~SString() { delete[] data_; } // ... char * data_; }; of Five C.21: "If you define or =delete any copy, move, or destructor function, define or =delete all of them." 1. Destructor 2. Copy Constructor 3. Copy Assignment Operator 4. Move Constructor declared, or are deleted. ## Special Members compiler implicitly declares ||default constructor|destructor|copy constructor|copy assignment|move constructor|move assignment| |---|---|---|---|---|---|---|

Template method Interfaces Destructor Liskov substitution principle Inheritance (interface versus implementation) Covariant return type Virtual in con- /destructor Shadowing Slicing Duck Typing Template method Interfaces Destructor Liskov substitution principle Inheritance (interface versus implementation) Covariant return type Virtual in con- /destructor Shadowing Slicing Duck Typing Template method Interfaces Destructor Liskov substitution principle Inheritance (interface versus implementation) Covariant return type Virtual in con- /destructor Shadowing Slicing Duck Typing

BExpectBoundary (92) ##### 1.4.8 TASCII85DecoderStream.Destroy Synopsis: Clean up instance Declaration: destructor Destroy; Override Visibility: public Description: Destroy closes the input stream using Close Synopsis: Flushed the data to the output stream and cleans up the encoder instance. Declaration: destructor Destroy; Override Visibility: public Description: Destroy writes the data remaining in the internal OnObjectCompare (110) ##### 2.4.6 TAVLTree.Destroy Synopsis: Destroy the TAVLTree instance Declaration: destructor Destroy; Override Visibility: public Description: Destroy clears the nodes (the node data is

and fName, of type TResourceDesc (??). We create them in the constructor and destroy them in the destructor. Type will always be RT_ACCELERATOR (??). We make the parameterless constructor of TAbstractResource must always be RT_ACCELERATOR (??)). So, GetType (??), GetName (??), the constructors and the destructor are implemented as follows: function TAcceleratorsResource.GetType: TResourceDesc; begin Result:=fType; TAcceleratorsResource.Create(aType, aName: TResourceDesc); begin Create; fName.Assign(aName); end; end; destructor TAcceleratorsResource.Destroy; begin fType.Free; fName.Free; inherited Destroy; end; Note that

unit case implementation procedure until const in program uses constructor inherited record var destructor inline reintroduce while div interface repeat with do label self xor downto mod set else nil shl Public Constructor init; Destructor done; Procedure SetCaption (AValue : String); Function GetCaption : String; end; It contains a constructor/destructor pair, and a method to get and set programmer is responsible for calling the constructor and the destructor explicitly when using objects. The declaration of a constructor or destructor is as follows: Constructors and destructors ▶— constructor

of an object o of type T ends when: (1.3) — if T is a class type with a non-trivial destructor (15.4), the destructor call starts, or (1.4) — the storage which the object occupies is released, or is reused of an object o of type T ends when: (1.3) — if T is a class type with a non-trivial destructor (15.4), the destructor call starts, or (1.4) — the storage which the object occupies is released, or is reused of an object o of type T ends when: (1.3) — if T is a class type with a non-trivial destructor (15.4), the destructor call starts, or (1.4) — the storage which the object occupies is released, or is reused

std::uint8_t struct exception_header cortex_m_cpu cpu{}; std::type_info* type_info; destructor_t* destructor; cache_t cache{}; std::uint32_t state_and_rel_address; struct cortex_m_cpu { register_t p_thrown_exception, std::type_info* p_type_info, destructor_t p_destructor) // TLS variable for std::current_exception active_exception = p_thrown_exception; auto& p_thrown_exception); exception_header.type_info = p_type_info; exception_header.destructor = p_destructor; capture_cpu_core_and_unwind1 (exception_header.cpu); raise_exception (exception_header);

compatible. Deprecated, use -Mtp instead. -Ss The name of constructors must be init, and the name of destructor should be done. -St Allow the static keyword in objects. This flag is obsolete since Free Pascal by using the -So switch. 17. Turbo Pascal permits more than one destructor for an object. In Free Pascal, there can be only one destructor. This restriction can also be removed by using the -So switch. (global) -So Same as -Mtp -Sr Transparent file names in ISO mode -Ss Constructor name must be init (destructor must be done) -Sv Support vector processing (use CPU vector extensions if available) -Sx Enable

Beware of destructors, which are often longer than they appear because of implicit member- and base-destructor calls! Another useful rule of thumb: it’s typically not cost effective to inline functions with variable is an object, its constructor is invoked every time it enters scope and is created, and its destructor is invoked every time it goes out of scope. // Inefficient implementation: for (int i = 0; i < the order in which the constructors were called. Since constructor order is indeterminate, so is destructor order. For example, at program-end time a static variable might have been destroyed, but code still

different special member functions of a class C++11; ## Using examples 1 2 3 Cpp a{}; 4 Cpp b{3}; 5 Destructor is called at the end of the scope 6 Cpp d{a}; 7 b = a; 8 // we omit move for now ## Special member 5c5edffc03874c64ed7c31a37d6f2f/p12_2.jpg) ## Treating the destructor class IOPort { public: IOPort() { puts("IOPort ctor"); } ~IOPort() { puts("IOPort dffc03874c64ed7c31a37d6f2f/p13_1.jpg) Andreas Fertig $1.10 Back to Basics ## Treating the destructor class IOPort { public: IOPort() { puts("IOPort ctor"); } virtual ~IOPort() { puts("IOPort