Error Overload Resolution Selected Implicitly-deleted Copy Assignment Operator

library Strings library Containers library Algorithms library Iterators library Numerics library Input/output library Localizations library Regular expressions library (C++11) Atomic operations library (C++11) Thread support library (C++11) Filesystem library (C++17) Technical Specifications move assignment operator [edit] C++ language Classes General overview class/struct types union types Members data c++ copy constructor assignment operator members static members the this pointer nested classes member templates bit fields using-declarations member functions member access specifiers constructors copy assignment operator is implicitly deleted and member initializer lists default member initializer(C++11) friend specifier explicit specifier converting constructor Special member functions default constructor copy constructor move constructor(C++11) copy assignment operator move assignment operator(C++11) destructor Inheritance base assignment operator overloading in c++ simple example and derived classes virtual member functions override(C++11) final(C++11) pure virtual functions and abstract classes [edit] A copy assignment operator of class T is a non-template non-static member function with the name operator= that takes exactly one parameter of type T, T&, const T&, volatile T&, or const volatile T&. For a type to be CopyAssignable, it must have a public copy assignment operator.

Assignment Operator Overloading In C++ Using Friend Function

Contents 1 Syntax 2 Explanation 3 Implicitly-declared copy assignment operator 4 Deleted implicitly-declared copy assignment operator 5 Trivial copy assignment operator 6 Implicitly-defined copy assignment operator 7 Notes 8 Copy-and-swap idiom 9 Example 10 Defect reports [edit] Syntax class_name & class_name :: operator= ( class_name ) (1) class_name & class_name :: operator= ( const class_name & ) (2) class_name & class_name :: operator= ( const class_name & ) = default; (3) (since C++11) class_name & class_name :: operator= ( const class_name & ) = delete; (4) (since C++11) [edit] Explanation Typical declaration of a copy assignment operator when copy-and-swap idiom can be used. Typical declaration of a copy assignment operator when copy-and-swap idiom cannot be used (non-swappable type or degraded performance). Forcing a copy assignment operator to be generated by the compiler. Avoiding implicit copy assignment. The copy assignment operator is called whenever selected by overload resolution, e.g. when an object appears on the left side of an assignment expression. [edit] Implicitly-declared copy assignment operator If no user-defined copy assignment operators are provided for a class type (struct, class, or union), the compiler will always declare o

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Assignment Operator Vs Copy Constructor

your last search results. Bug10217 - Confusing error message with deleted implicit assignment operator c# copy constructors/assignment operators Summary: Confusing error message with deleted implicit copy constructors/assignment op... Status: RESOLVED FIXED Product: clang assignment operator in c Classification: Unclassified Component: C++11 Version: trunk Platform: Macintosh MacOS X Importance: P normal Assigned To: Richard Smith URL: Keywords: Depends on: Blocks: Show dependency tree /graph Reported: 2011-06-28 05:15 http://en.cppreference.com/w/cpp/language/as_operator CDT by jonathan.sauer Modified: 2012-04-02 16:08 CDT (History) CC List: 9 users (show) davidhunter22 dgregor jgunthorpe jyasskin llvm-bugs matti.niemenmaa+llvmbugs nicolasweber richard-llvm scshunt See Also: Attachments Add an attachment (proposed patch, testcase, etc.) Note You need to log in before you can comment on or make changes to this bug. Description jonathan.sauer 2011-06-28 05:15:31 CDT Consider the following code (adapted from libc++): template https://llvm.org/bugs/show_bug.cgi?id=10217 struct __compressed_pair { __compressed_pair() {} __compressed_pair(__compressed_pair&&) {} }; typedef __compressed_pair P; P foo(); int main(int, char**) { P s; s = foo(); } Compiling this with clang r133996 results in: $ clang -std=c++0x clang.cpp clang.cpp:15:4: error: overload resolution selected deleted operator '=' s = foo(); ~ ^ ~~~~~ clang.cpp:2:8: note: candidate function (the implicit copy assignment operator) has been explicitly deleted struct __compressed_pair ^ 1 error generated. This behaviour is correct as per 12.8p18, however the error message is quite confusing: How can an *implicit* operator be *explicitely* deleted? I think the note should end with "... by the explicit move {constructor|assignment operator}". Also, it should point to this move constructor/operator instead of to the beginning of the class definition. Comment 1 Richard Smith 2011-10-10 12:19:33 CDT *** Bug 11101 has been marked as a duplicate of this bug. *** Comment 2 Sean Hunt 2011-10-10 13:18:43 CDT Work under way to fix. Comment 3 Richard Smith 2011-10-10 14:24:00 CDT *** Bug 10811 has been marked as a duplicate of this bug. *** Comment 4 Jason Gunthorpe 2011-10-23 18:42:3

Localizations library Regular expressions library (C++11) Atomic operations library (C++11) Thread support library (C++11)   C++ language http://naipc.uchicago.edu/2014/ref/cppreference/en/cpp/language/as_operator.html General topics Preprocessor Comments Keywords ASCII chart Escape sequences History of C++ Flow control Conditional execution statements if statement switch statement Iteration statements for loop range-for loop (C++11) while loop do-while loop Jump statements continue statement break statement goto statement return statement Functions function declaration assignment operator lambda function declaration function template inline specifier exception specifications (deprecated) noexcept specifier (C++11) Exceptions throw expression try-catch block Namespaces namespace declaration namespace aliases Types fundamental types compound types enumeration types union types function types decltype specifier (C++11) Specifiers cv specifiers storage duration specifiers constexpr specifier (C++11) copy assignment operator auto specifier (C++11) alignas specifier (C++11) Initialization default initialization value initialization zero initialization copy initialization direct initialization aggregate initialization list initialization (C++11) constant initialization reference initialization Literals integer literals character literals floating-point literals string literals boolean literals nullptr (C++11) user-defined (C++11) Expressions value categories order of evaluation operators operator precedence alternative representations Utilities Types typedef declaration type alias declaration (C++11) attributes (C++11) Casts implicit conversions const_cast conversion static_cast conversion dynamic_cast conversion reinterpret_cast conversion C-style and functional cast Memory allocation new expression delete expression Classes class declaration this pointer access specifiers friend specifier initializer lists Class-specific function properties virtual function override specifier (C++11) final specifier (C++11) explicit (C++11) static Special member functions default constructor copy constructor move constructor (C++11) copy assignment move assignment (C++11) destructor Templates class template function template template specialization parameter packs (C++11) Miscellaneous