C Lambda expression naming principles are: descriptive, unique, brief and consistent. The specific practices are as follows: Descriptive: The name should clearly describe the purpose of the lambda expression. Uniqueness: Lambda expressions with different semantics should have different names. Short: The name should be as short as possible. Consistent: Follow consistent naming conventions within the project.
C Lambda expression naming principles and practices
Principles:
- Descriptive: The name should clearly and concisely describe the purpose of the lambda expression.
- Unique: Lambda expressions with different semantics should have different names to avoid confusion.
- Short: Names should be as short as possible but still convey the necessary meaning.
- Consistency: Follow consistent naming conventions within the project.
Practice examples:
The following examples demonstrate how to name lambda expressions for different purposes:
// 过滤偶数的 lambda 函数 auto filter_even = [](int n) { return n % 2 == 0; }; // 计算字符串长度的 lambda 函数 auto get_length = [](const std::string& str) { return str.length(); }; // 在数组中搜索指定元素的 lambda 函数 auto find_element = [](const std::vector<int>& vec, int element) { return std::find(vec.begin(), vec.end(), element) != vec.end(); };
In these examples, the name Is:
- filter_even: describes the function of filtering even numbers.
- get_length: Describes the function of getting the length of a string.
- find_element: Describes the function of searching for an element in an array and distinguishing it by specifying the array and element parameters.
Practical case:
Consider a program that calculates the total amount of an order. We can use lambda expressions to calculate the total price of each item in the order:
// 计算单个商品总价的 lambda 函数 auto calculate_item_price = [](const Item& item) { return item.price * item.quantity; }; // 计算订单总额的 lambda 函数 auto get_order_total = [](const Order& order) { int total = 0; for (const Item& item : order.items) { total += calculate_item_price(item); } return total; };
Here, the lambda expressions are named calculate_item_price and get_order_total, they are clear Describes specific functionality without causing confusion.
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