How do I resolve 'template argument deduction/substitution failed' in C++?

In C++, the error message 'template argument deduction/substitution failed' occurs when the compiler is unable to deduce template arguments from the function call. This issue usually arises because of type mismatches, ambiguous template parameters, or incorrect usage of template types.

To resolve this error, ensure that the types used in your template function arguments match the expected types defined in the template. Sometimes, explicit template arguments may need to be provided to guide the compiler in the deduction process.

Example:

// Example of resolving template argument deduction error #include using namespace std; template void printValue(T value) { cout << value << endl; } int main() { printValue(42); // Works fine printValue(3.14); // Works fine printValue("Hello"); // Works fine // Uncommenting the following line will cause a deduction failure // printValue(nullptr); // Template argument needs to be specified return 0; }

C++ template argument deduction error handling C++ templates type mismatch

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