Quick Answer

Resolve overloaded function calls.

Understanding the Issue

Swift cannot determine which function overload to use when multiple versions match the call signature.

The Problem

This code demonstrates the issue:

Swift Error 
func process(_ value: Int) {}
func process(_ value: String) {}
process(3.14) // Ambiguous

The Solution

Here's the corrected code:

Swift Fixed 
// Solution 1: Add specific overload
func process(_ value: Double) {}

// Solution 2: Explicit type casting
process(Int(3.14))

// Solution 3: Named parameters
func process(int value: Int) {}
func process(string value: String) {}
process(int: 3)

// Solution 4: Type annotations
let input: Int = 3
process(input)

Key Takeaways

Make overloads distinct or provide explicit types at call sites.