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Lambdas

Collaboration diagram for Lambdas:

libsigc++ ships with basic lambda functionality and the sigc::group adaptor that uses lambdas to transform a functor's parameter list. More...

Modules
	group()
	sigc::group() alters an arbitrary functor by rebuilding its arguments from one or more lambda expressions.
Classes
struct	sigc::lambda_base
	A hint to the compiler. More...
struct	sigc::lambda<T_type>
	Lambda type. More...

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Detailed Description

libsigc++ ships with basic lambda functionality and the sigc::group adaptor that uses lambdas to transform a functor's parameter list.

The lambda selectors sigc::_1, sigc::_2, ..., sigc::_9 are used to select the first, second, ..., nineth argument from a list.

Examples:

   std::cout << sigc::_1(10,20,30); // returns 10
   std::cout << sigc::_2(10,20,30); // returns 20
   ...

Operators are defined so that lambda selectors can be used e.g. as placeholders in arithmetic expressions.

Examples:

   std::cout << (sigc::_1 + 5)(3); // returns (3 + 5)
   std::cout << (sigc::_1 * sigc::_2)(7,10); // returns (7 * 10)

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