#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
// Define a simple data structure
struct Product {
std::string name;
double price;
};
// Function demonstrating ranges::for_each with and without projections
void update_and_display_inventory(std::vector<Product>& inventory) {
// 1. Using projections to apply a 10% discount directly to the 'price' member
// The projection &Product::price extracts the double before passing it to the lambda.
std::ranges::for_each(inventory, [](double& price) {
price *= 0.90; // Apply 10% discount
}, &Product::price);
// 2. Using ranges::for_each to iterate over the entire range and print details
std::ranges::for_each(inventory, [](const Product& p) {
std::cout << "Product: " << p.name << " | Discounted Price: $" << p.price << "\n";
});
}
int main() {
// Initialize a vector of products
std::vector<Product> store_inventory = {
{"Laptop", 1200.0},
{"Mouse", 25.0},
{"Keyboard", 75.0}
};
update_and_display_inventory(store_inventory);
}
/*
run:
Product: Laptop | Discounted Price: $1080
Product: Mouse | Discounted Price: $22.5
Product: Keyboard | Discounted Price: $67.5
*/
