Linker Error Undefined Reference Class
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Undefined Reference To Function C++
ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack c++ undefined reference to class Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Linker Error C++ “undefined reference ” [duplicate] up vote 9 down
C++ Undefined Reference To Constructor
vote favorite 2 Possible Duplicate: What is an undefined reference/unresolved external symbol error and how do I fix it? Trying to compile my program via g++ -o prog1 main.cpp -std=c++0x I get the error: /tmp/cc1pZ8OM.o: In function `main': main.cpp:(.text+0x148): undefined reference to `Hash::insert(int, char)' collect2: error: ld returned 1 exit status main.cpp #include
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C++ Undefined Reference To Class Function
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Undefined Reference To C++ Template Function
the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags linking error undefined reference to function Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only http://stackoverflow.com/questions/14557657/linker-error-c-undefined-reference takes a minute: Sign up Linker error : undefined reference to class::'methods' in C++ up vote 1 down vote favorite 1 I got a trouble while compiling the following source code [linker error] undefined reference to 'dish::dish()' [linker error] undefined reference to 'dish::~dish()' [linker error] undefined reference to 'dish::ShowResult()' Can anybody help me? THE HEADER FILE(dish.h): #ifndef DISH_H #define DISH_H http://stackoverflow.com/questions/16154919/linker-error-undefined-reference-to-classmethods-in-c class dish { public: dish(); dish(std::string name, std::string variety, float caloric, float price); ~dish(); static int GetN(); void SetN(int N); static int IncrementN(); std::string GetName() const; void SetName(std::string name); std::string GetVariety() const; void SetVariety(std::string variety); float GetCaloric() const; void SetCaloric(float caloric); float GetPrice() const; void SetPrice(float price); void Enter(); void ShowResult(); private: std::string name; std::string variety; float caloric; float price; static int N; }; int dish::N; #endif and the dish.cpp: #include
error message (or “unresolved external symbol, for Visual C++ users). This is not actually a message from the compiler, but is emitted by the linker, so the first thing to do is to understand what the linker is, and https://latedev.wordpress.com/2014/04/22/common-c-error-messages-2-unresolved-reference/ what it does. Linker 101 To understand the linker, you have to understand how C++ programs https://ubuntuforums.org/showthread.php?t=662844 are built. For all but the very simplest programs, the program is composed of multiple C++ source files (also known as “translation units”). These are compiled separately, using the C++ compiler, to produce object code files (files with a .o or a .obj extension) which contain machine code. Each object code file knows nothing about the others, so if you call undefined reference a function from one object file that exists in another, the compiler cannot provide the address of the called function. This is where the the linker comes in. Once all the object files have been produced, the linker looks at them and works out what the final addresses of functions in the executable will be. It then patches up the addresses the compiler could not provide. It does the same for any libraries (.a and .lib files) you undefined reference to may be using. And finally it writes the executable file out to disk. The linker is normally a separate program from the compiler (for example, the GCC linker is called ld) but will normally be called for you when you use your compiler suite’s driver program (so the GCC driver g++ will call ld for you). Traditionally, linker technology has lagged behind compilers, mostly because it’s generally more fun to build a compiler than to build a linker. And linkers do not necessarily have access to the source code for the object files they are linking. Put together, you get a situation where linker errors, and the reasons for them, can be cryptic in the extreme. Undefined reference Put simply, the “undefined reference” error means you have a reference (nothing to do with the C++ reference type) to a name (function, variable, constant etc.) in your program that the linker cannot find a definition for when it looks through all the object files and libraries that make up your project. There are any number of reasons why it can’t find the definition – we’ll look at the commonest ones now. No Definition Probably the most common reason for unresolved reference errors is that you simply have not defined the thing you are referencing. This code illustrates the problem: int foo(); int main() { foo(); } Here, we have a d
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