lambda trailing return type


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  • How do you return a value from a lambda expression?

    In Java, we can return a value from a lambda expression using the arrow (->) operator.
    The arrow operator separates the parameters from the body of the lambda expression.
    The return type of the lambda expression is inferred by the compiler, based on the context in which it is used.

  • Why use trailing return types?

    Using trailing return types neatly aligns the function names: auto is_empty() -> bool; auto number_of_vertices()() -> int; auto vertices_begin() -> VertexIterator; The notation can be shorter than the standard return type, for example when returning a type defined inside a class such as VertexIterator above.28 jan. 2022

  • To use the trailing return type feature, declare a generic return type with the auto keyword before the function identifier, and specify the exact return type after the function identifier.
    For example, use the decltype keyword to specify the exact return type.

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