Delegating Methods to Components

Medium Composition & Aggregation

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Problem Statement

Create a `Logger` class with a `void write(std::string msg)` method that prints ‘LOG: [msg]’. Create an `App` class that instantiates `Logger` using composition. The `App` should have an `execute(std::string msg)` method that delegates the logging task to its internal `Logger` component by calling `write()`.

Input Format

A single string message.

Output Format

Print the log message.

Constraints

Message contains no spaces.

Sample Input

Started

Sample Output

LOG: Started

Explanation

Delegation allows a parent class to expose functionality that is actually handled behind the scenes by its internal component objects.

Starter Code

#include <iostream>
#include <string>

class Logger {
public:
    // Write your code here
};

class App {
public:
    // Write your code here
};

int main() {
    // Read message, instantiate App and call execute
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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