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Lambda expressions are anonymous functions in C that are used to create one-time functions. They access external scope variables through capture lists and can receive parameters and define return types. Lambda expressions are often used to quickly create or pass functions at runtime. They have access to Lvalues and Rvalues, and can be stateful or stateless.
Usage of Lambda expression in C
Lambda expression is a powerful feature in C that allows you to define it once anonymous function. They are typically used where functions need to be created quickly or passed around at runtime.
Grammar
The general syntax of Lambda expression is:
[capture list](parameters) -> return_type { body }
Among them:
Practical case
Let us create a lambda expression to convert the string to uppercase:
auto to_upper = [](const std::string& s) -> std::string { std::string result; for (char c : s) { result.push_back(std::toupper(c)); } return result; };
We can Using this lambda expression, for example:
std::string my_string = "hello, world"; std::string upper_string = to_upper(my_string);
upper_string
will now contain the converted string "HELLO, WORLD".
Note
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