Join.hh File Reference

#include "detail/Joined.hh"

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Functions
template<class InputIterator , class Conjunction >
detail::Joined< InputIterator, Conjunction, detail::StreamValue >	celeritas::join (InputIterator first, InputIterator last, Conjunction &&conjunction)
	Join items, similar to python's "str.join" method.
template<class InputIterator , class Conjunction , class UnaryOperation >
detail::Joined< InputIterator, Conjunction, detail::UnaryToStream< UnaryOperation > >	celeritas::join (InputIterator first, InputIterator last, Conjunction &&conjunction, UnaryOperation &&op)
	Join items transformed by a helper functor.
template<class InputIterator , class Conjunction , class StreamOp >
detail::Joined< InputIterator, Conjunction, StreamOp >	celeritas::join_stream (InputIterator first, InputIterator last, Conjunction &&conjunction, StreamOp &&op)
	Join using a functor that takes (ostream&, value).

Function Documentation

join() [1/2]

template<class InputIterator , class Conjunction >

detail::Joined< InputIterator, Conjunction, detail::StreamValue > celeritas::join	(	InputIterator	first,
		InputIterator	last,
		Conjunction &&	conjunction
	)

Join items, similar to python's "str.join" method.

This utility function will concatenate the values passed to it. The given conjunction ONLY appears between values.

cout << celeritas::join(foo.begin(), foo.end(), ", ") << endl

The result is a thin class that is streamable. (It can explicitly be converted to a string with the to_string method). By doing this instead of returning a std::string, large and dynamic containers can be e.g. saved to disk.

join() [2/2]

template<class InputIterator , class Conjunction , class UnaryOperation >

detail::Joined< InputIterator, Conjunction, detail::UnaryToStream< UnaryOperation > > celeritas::join	(	InputIterator	first,
		InputIterator	last,
		Conjunction &&	conjunction,
		UnaryOperation &&	op
	)

Join items transformed by a helper functor.

This joins all given elements, inserting conjunction between them. The 'op' operator must transform each element into a printable object. For example,

[](const std::pair<int, int>& item) { return item->first; }

could be used to get the 'key' item of a map.