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Understanding the "Unresolved External Symbol" Error
When working with multiple object files in Visual Studio, you may encounter the infamous "unresolved external symbol" error. This error arises when the linker cannot locate a referenced symbol, typically a function definition, within the specified object files.
Identifying the Cause
The root cause of this error is often attributed to missing or incorrect definitions of functions that are declared in headers but not defined in implementation files (e.g., *.cpp). Another common scenario involves linking without the necessary libraries or dynamic link libraries (DLLs) that provide the implementations of these functions.
Examples of Declarations and Definitions
Consider the following code example:
// A.hpp class A { public: void myFunc(); // Function declaration };
// A.cpp // Function definition void A::myFunc() { // Code implementation }
In this example, the declaration of myFunc() is found in A.hpp, but the definition is provided in A.cpp. The linker searches for the definition during linking, and if it is not found within the object files, it reports the unresolved symbol error.
Possible Solutions
To resolve the "unresolved external symbol" error effectively, you can undertake the following troubleshooting steps:
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