Resolving invalid conversion errors

Oct 13, 2025 by pinkandtrash.com 54 views

Introduction

When compiling code, encountering errors can be frustrating and time-consuming. In this article, we will explore the error "no matching function for call to 'min(float, int)'" and provide a step-by-step guide to resolve it.

Understanding the Error

The error "no matching function for call to 'min(float, int)'" occurs when the compiler is unable to find a matching function for the min() function call. In this case, the min() function is being called with a float and an int argument.

Analyzing the Code

The code snippet provided is from a C++ project, and the error is occurring in the update_random_value() function. The line of code causing the error is:

current_values[ch] = random(settings[ch], min(settings[ch]+ settings[ch+1], 4095));

Resolving the Error

To resolve this error, we need to ensure that the min() function is called with arguments of the same type. In this case, we can modify the code to use the min() function with two float arguments:

current_values[ch] = random(settings[ch], min((float)settings[ch] + (float)settings[ch+1], 4095.0f));

Alternatively, we can use the std::min() function with two float arguments:

current_values[ch] = random(settings[ch], std::min((float)settings[ch] + (float)settings[ch+1], 4095.0f));

Additional Error

In addition to the "no matching function for call to 'min(float, int)'" error, the code also contains an invalid conversion error. The error occurs when trying to assign a const uint16_t* to a uint16_t* variable. To resolve this error, we need to modify the code to use a pointer to a uint16_t instead of a const uint16_t*:

uint16_t* LOG = ...;
uint16_t* EXP = ...;
uint16_t* RAMP = ...;

Conclusion

In this article, we explored the error "no matching function for call to 'min(float, int)'" and provided a step-by-step guide to resolve it. We also identified and resolved an additional error related to invalid conversion. By following these steps, you should be able to resolve the errors and successfully compile your code.

Common Issues

Mismatched types: Ensure that the arguments passed to the min() function are of the same type.
Invalid conversion: Be aware of the types of variables being assigned and ensure that the types match.
Missing includes: Verify that the necessary headers are included to use the min() function.

Best Practices

Use the std::min() function: Instead of using the min() function, use the std::min() function to ensure that the correct function is called.
Use type casting: Use type casting to ensure that the arguments passed to the min() function are of the same type.
Verify includes: Verify that the necessary headers are included to use the min() function.

Example Use Cases

Using the min() function: Use the min() function to find the minimum value between two numbers.
Using the std::min() function: Use the std::min() function to find the minimum value between two numbers.
Resolving invalid conversion errors: Resolve invalid conversion errors by using the correct type for the variable being assigned.
Q&A: Resolving the "no matching function for call to 'min(float, int)'" Error ==========================================================================

Q: What is the "no matching function for call to 'min(float, int)'" error?

A: The "no matching function for call to 'min(float, int)'" error occurs when the compiler is unable to find a matching function for the min() function call. In this case, the min() function is being called with a float and an int argument.

Q: Why is the compiler unable to find a matching function?

A: The compiler is unable to find a matching function because the min() function is being called with arguments of different types. The min() function expects two arguments of the same type, but in this case, one argument is a float and the other is an int.

Q: How can I resolve the "no matching function for call to 'min(float, int)'" error?

A: To resolve this error, you can modify the code to use the min() function with two float arguments, or use the std::min() function with two float arguments.

Q: What is the difference between the `min()` function and the `std::min()` function?

A: The min() function is a built-in function that returns the minimum value between two numbers. The std::min() function is a function from the C++ Standard Library that also returns the minimum value between two numbers. The main difference between the two functions is that the std::min() function is more flexible and can be used with a wider range of data types.

Q: How can I use the `std::min()` function to resolve the "no matching function for call to 'min(float, int)'" error?

A: To use the std::min() function, you can include the <algorithm> header file and use the std::min() function with two float arguments. For example:

#include <algorithm>

float min_value = std::min((float)settings[ch] + (float)settings[ch+1], 4095.0f);

Q: What are some common issues that can cause the "no matching function for call to 'min(float, int)'" error?

A: Some common issues that can cause the "no matching function for call to 'min(float, int)'" error include:

Mismatched types: Ensure that the arguments passed to the min() function are of the same type.
Invalid conversion: Be aware of the types of variables being assigned and ensure that the types match.
Missing includes: Verify that the necessary headers are included to use the min() function.

Q: How can I prevent the "no matching function for call to 'min(float, int)'" error in the future?

A: To prevent the "no matching function for call to 'min(float, int)'" error in the future, you can:

Use the std::min() function: Instead of using the min() function, use the std::min() function to ensure that the correct function is called.
Use type casting: Use type casting to ensure that the arguments passed to the min() function are of the same type.
Verify includes: Verify that the necessary headers are included to use the min() function.

Q: What are some best practices for resolving the "no matching function for call to 'min(float, int)'" error?

A: Some best practices for resolving the "no matching function for call to 'min(float, int)'" error include:

Use the std::min() function: Instead of using the min() function, use the std::min() function to ensure that the correct function is called.
Use type casting: Use type casting to ensure that the arguments passed to the min() function are of the same type.
Verify includes: Verify that the necessary headers are included to use the min() function.

Q: Can you provide an example of how to use the `std::min()` function to resolve the "no matching function for call to 'min(float, int)'" error?

A: Here is an example of how to use the std::min() function to resolve the "no matching function for call to 'min(float, int)'" error:

#include <algorithm>

float min_value = std::min((float)settings[ch] + (float)settings[ch+1], 4095.0f);

This code uses the std::min() function to find the minimum value between the sum of settings[ch] and settings[ch+1] and the value 4095.0f. The std::min() function is used with two float arguments, which resolves the "no matching function for call to 'min(float, int)'" error.