# <limits>

**[<limits>](https://en.cppreference.com/w/cpp/header/limits)** provides `std::numeric_limits<T>`, a traits class that gives you compile-time constants about numeric types: `std::numeric_limits<int>::max()`, `std::numeric_limits<float>::epsilon()`, etc.

Use it to write generic code that adapts to the numeric type without hardcoding values.

## Example

This example queries the maximum, minimum, and epsilon values for various numeric types at compile time.

```cpp
// compile: g++ -std=c++11 -o limitsexample limitsexample.cpp
// run: ./limitsexample
// description: query numeric limits

#include <limits>
#include <iostream>

int main() {
    std::cout << "int max: " << std::numeric_limits<int>::max() << "\n";
    std::cout << "float epsilon: " << std::numeric_limits<float>::epsilon() << "\n";
    std::cout << "double min: " << std::numeric_limits<double>::min() << "\n";
    
    return 0;
}
```