Clang-Tidy: Narrowing conversion from 'double' to 'int'
时间: 2024-01-02 10:04:11 浏览: 132
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This warning message from Clang-Tidy indicates that there is a potential narrowing conversion from a double type to an int type. A narrowing conversion means that some information might be lost during the conversion.
In C++, a double is a floating-point type that can represent decimal numbers with a higher precision compared to an int, which is an integer type. When you assign a double value to an int variable, the compiler may issue a warning because the fractional part of the double value will be truncated, losing precision.
To resolve this warning, you have a few options:
1. If you are intentionally truncating the fractional part, you can use a static_cast to explicitly convert the double value to an int:
```cpp
double myDouble = 3.14;
int myInt = static_cast<int>(myDouble);
```
2. If you want to perform a rounding operation, you can use the round or nearbyint functions from the `<cmath>` library:
```cpp
#include <cmath>
double myDouble = 3.14;
int myInt = std::round(myDouble); // or std::nearbyint(myDouble)
```
3. If you want to avoid the narrowing conversion altogether, you can choose a different type that can represent decimal numbers with higher precision, such as float or double.
It's important to note that the appropriate solution depends on your specific use case and the desired behavior of your program.
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