"Call to std::pair is ambiguous" by Clion but code can be compiled

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The "Call to std::pair is ambiguous" error in CLion typically occurs when there is ambiguity in the way the compiler interprets a function call involving a std::pair. This might be due to multiple factors, such as function overloads, template instantiation, or other contextual information.

Here's what you can do to troubleshoot and resolve this issue:

  1. Check for Namespaces and Using Directives:
    Make sure you are not importing or using multiple namespaces that could introduce ambiguity. If you are using namespaces, make sure you are using the correct namespace qualifiers when referring to std::pair.

  2. Check for Overloaded Functions:
    If you have overloaded functions that accept std::pair as arguments, the compiler might be confused about which overload to select. In such cases, you can specify the argument type explicitly or provide more context to help the compiler resolve the ambiguity.

  3. Check Template Instantiation:
    If you are using templates in your code, it's possible that the template instantiation is causing ambiguity. Ensure that the template parameters and types are well-defined and unambiguous.

  4. Compiler Settings in CLion:
    Ensure that the compiler settings in CLion are correctly configured for your project. Sometimes, discrepancies in compiler flags or settings can lead to such errors.

  5. Use Fully Qualified Names:
    Instead of relying on namespace imports, use fully qualified names for std::pair and other relevant types. For example: std::pair<int, double>.

  6. Clean and Rebuild:
    Sometimes, issues can be resolved by cleaning the build artifacts and rebuilding the project. This can help eliminate any potential leftover artifacts causing the ambiguity.

  7. Update CLion and Compiler:
    Ensure that you are using the latest version of CLion and the compiler. Sometimes, older versions might have issues that are resolved in newer releases.

  8. Check Macros or Preprocessor Directives:
    If you are using macros or preprocessor directives that redefine or modify the behavior of standard library components, it might be causing ambiguity. Review any such macros for unintended side effects.

If the code can be compiled successfully but CLion still shows the error, it's possible that the IDE's code analysis is detecting a potential issue that doesn't actually affect the compilation. In such cases, you can consider ignoring the error in the IDE if you are confident that the code is correct.

If you continue to face issues, consider sharing a specific code snippet that triggers the error, along with any relevant compiler settings and include directives, so that a more targeted solution can be provided.