C++ lambda expression naming principles and practices

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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