Error C2758 Must Be Initialized In Constructor
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Ue4 References Must Be Initialized
Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 a member of reference type must be initialized c++ million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Reference varable with error, must be initialized in constructor base/member initializer up vote 2 down vote favorite 1 I got provides no initializer for reference member following error when I try to compile the source-code below. Can anybody describe why this error exists and how I can fix it? Error 1 error C2758: 'A::s_' : must be initialized in constructor base/member initializer #include
Must Be Initialized In Constructor Base/member Initializer List
<< endl; } A& operator=(const A& rhs) { cout << "A::copyassign" << endl; } private: string& s_; }; int main() { return 0; } c++ constructor compiler-errors visual-studio-2012 share|improve this question asked Oct 15 '12 at 6:36 Number42 10228 1 You can't really have a semantically valid assignment operator when you have a reference member. You can't reassign it to a different string. It will only modify the original string being referenced. –Peter Wood Oct 15 '12 at 7:05 add a comment| 3 Answers 3 active oldest votes up vote 7 down vote accepted First of all, your A::s_ is a reference to a std::string; that means that it's referencing something that must exists somewhere. Due of his reference type, and the fact that the references must be initialized at the moment they're created, you must initialize A::s_ in ALL the A constructors (as pointed by other users): class A { public: A(string& s) : s_(s) { cout << "A::ctor" << endl; } A(const A& rhs) : s_(rhs.s_) // <-- here too!! { cout << "A::copy" << endl; } ~A() { cout << "A::dtor" << endl; } A& operator=(const A& rhs) { cout << "A::copyassign" << endl; } private: string& s_; }; And now, back to the first thing I mentioned; the A::s_ must reference someth
here for a quick overview of the site Help Center Detailed answers to any questions you might must be initialized by constructor not by have Meta Discuss the workings and policies of this site About initializer list in c++ Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million http://stackoverflow.com/questions/12890438/reference-varable-with-error-must-be-initialized-in-constructor-base-member-ini programmers, just like you, helping each other. Join them; it only takes a minute: Sign up C++ reference type must be initialized [duplicate] up vote 0 down vote favorite This question already has an answer here: Must a reference type be initialized in constructor initialization list? 3 answers I'm having a spot of trouble with http://stackoverflow.com/questions/26088985/c-reference-type-must-be-initialized some reference variables, first off here is my class Header file #pragma once #include "ImageLoader.h" #include "FontLoader.h" class LevelState { public: LevelState() private: ImageLoader& _imageLoader; FontLoader& _fontLoader; } Class file #include "LevelState.h" LevelState::LevelState() { } now when I go to build I get these errors Error 2 error C2758: 'LevelState::_fontLoader' : a member of reference type must be initialized Error 1 error C2758: 'LevelState::_imageLoader' : a member of reference type must be initialized So I then went ahead and updated my constructor to take in a ImageLoader and FontLoader like so LevelState::LevelState(FontLoader& fontLoader, ImageLoader& imageLoader) { _fontLoader = fontLoader; _imageLoader = imageLoader; } But I still get the same error as above, what is going wrong? I know I can change my references to pointers and just assign them that way, but I would prefer to use references as these are safer. c++ sfml share|improve this question asked Sep 28 '14 at 19:51 Canvas 2,93042057 marked as duplicate by Baum mit Augen, Mysticialc++
error messages. Tweet Most popular tags programming languages visual c++ compile time error messages programming-languages visual-c compile-time-error-messages java mysql dbms runtime-error-messages http://www.errorbase.net/2146/error-c2758-const-must-be-initialized-in-constructor-base-member-initializer-list Photoshop oracle netbeans nudge photoshop mosek rasterize subversion php sql vector data svn facebook tomcat latex apache visual sap phpmyadmin runtime error messages c type layer windows https://bytes.com/topic/c/answers/744653-compile-error-about-member-variable-initialization eclipse-svn-subversion-java photos pool paypal sqlserver driver commit rsa 2010 adobe-premiere-pro c# jquery javascript firebug lyx asp memory-leaks Error C2758: (const) : must be initialized in constructor base/member must be initializer list 0 votes The constructor does not initialize the const variable in an initializer list. The compiler leaves the constant undefined. Reference and const member variables must be given a value when initialized or in the constructor. Ex: struct A { const int i; A(int i) {}; // C2758 }; compile time error messages must be initialized programming languages visual c++ requested 5 years ago by errorbase (170,010 points) 2 Solutions 0 votes This article is a derivative work based on http://msdn.microsoft.com/en-us/library/67e2bzsz.aspx" title="http://msdn.microsoft.com/en-us/library/67e2bzsz.aspx" target="_blank">Compiler Error C2758 which is provided by http://msdn.microsoft.com/en-us/library/60k1461a.aspx" title="http://msdn.microsoft.com/en-us/library/60k1461a.aspx" target="_blank">MSDN Community Content - Visual C++. solved 5 years ago by errorbase (170,010 points) 0 votes Possible resolution: struct A { const int i; A(int i) : i(0) {}; }; solved 5 years ago by errorbase (170,010 points) Related errors 0 votes 3 solutions Error C2436: (identifier) : member function or nested class in constructor initializer list requested 5 years ago by errorbase (170,010 points) compile time error messages programming languages visual c++ 0 votes 3 solutions Error C2612: trailing (char) illegal in base/member initializer list requested 5 years ago by errorbase (170,010 points) compile time error messages programming languages visual c++ 0 votes 3 solutions Error C2866: (variable) : a const static data member of a managed type must be initialized at the point of declaration requeste
help? Post your question and get tips & solutions from a community of 418,505 IT Pros & Developers. It's quick & easy. compile error about member variable initialization P: n/a George2 Hello everyone, Why the below code segment will result in compile error? When I change code to the comment one (constructor), it can compile. The compiler is too stupid? :-) I am using Visual Studio 2005. -------------------- main.cpp(13) : error C2758: 'Foo::vi' : must be initialized in constructor base/member initializer list see declaration of 'Foo::vi' -------------------- Expand|Select|Wrap|Line Numbers #include