Collaboration diagram for SGI:

Classes
struct	__gnu_cxx::project1st< _Arg1, _Arg2 >

struct	__gnu_cxx::project2nd< _Arg1, _Arg2 >

struct	__gnu_cxx::select1st< _Pair >

struct	__gnu_cxx::select2nd< _Pair >

Functions
template<typename _Tp >
const _Tp &	__gnu_cxx::__median (const _Tp &__a, const _Tp &__b, const _Tp &__c)

template<typename _Tp , typename _Compare >
const _Tp &	__gnu_cxx::__median (const _Tp &__a, const _Tp &__b, const _Tp &__c, _Compare __comp)

size_t	std::bitset< _Nb >::_Find_first () const noexcept

size_t	std::bitset< _Nb >::_Find_next (size_t __prev) const noexcept

template<class _Operation1 , class _Operation2 >
unary_compose< _Operation1, _Operation2 >	__gnu_cxx::compose1 (const _Operation1 &__fn1, const _Operation2 &__fn2)

template<class _Operation1 , class _Operation2 , class _Operation3 >
binary_compose< _Operation1, _Operation2, _Operation3 >	__gnu_cxx::compose2 (const _Operation1 &__fn1, const _Operation2 &__fn2, const _Operation3 &__fn3)

template<class _Result >
constant_void_fun< _Result >	__gnu_cxx::constant0 (const _Result &__val)

template<class _Result >
constant_unary_fun< _Result, _Result >	__gnu_cxx::constant1 (const _Result &__val)

template<class _Result >
constant_binary_fun< _Result, _Result, _Result >	__gnu_cxx::constant2 (const _Result &__val)

template<typename _InputIterator , typename _Size , typename _OutputIterator >
std::pair< _InputIterator, _OutputIterator >	__gnu_cxx::copy_n (_InputIterator __first, _Size __count, _OutputIterator __result)

template<typename _InputIterator , typename _Distance >
void	__gnu_cxx::distance (_InputIterator __first, _InputIterator __last, _Distance &__n)

template<class _Tp >
_Tp	__gnu_cxx::identity_element (std::multiplies< _Tp >)

template<class _Tp >
_Tp	__gnu_cxx::identity_element (std::plus< _Tp >)

template<typename _InputIterator1 , typename _InputIterator2 >
int	__gnu_cxx::lexicographical_compare_3way (_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2)

template<typename _Tp , typename _Integer >
_Tp	__gnu_cxx::power (_Tp __x, _Integer __n)

template<typename _Tp , typename _Integer , typename _MonoidOperation >
_Tp	__gnu_cxx::power (_Tp __x, _Integer __n, _MonoidOperation __monoid_op)

template<typename _InputIterator , typename _RandomAccessIterator >
_RandomAccessIterator	__gnu_cxx::random_sample (_InputIterator __first, _InputIterator __last, _RandomAccessIterator __out_first, _RandomAccessIterator __out_last)

template<typename _InputIterator , typename _RandomAccessIterator , typename _RandomNumberGenerator >
_RandomAccessIterator	__gnu_cxx::random_sample (_InputIterator __first, _InputIterator __last, _RandomAccessIterator __out_first, _RandomAccessIterator __out_last, _RandomNumberGenerator &__rand)

template<typename _ForwardIterator , typename _OutputIterator , typename _Distance >
_OutputIterator	__gnu_cxx::random_sample_n (_ForwardIterator __first, _ForwardIterator __last, _OutputIterator __out, const _Distance __n)

template<typename _ForwardIterator , typename _OutputIterator , typename _Distance , typename _RandomNumberGenerator >
_OutputIterator	__gnu_cxx::random_sample_n (_ForwardIterator __first, _ForwardIterator __last, _OutputIterator __out, const _Distance __n, _RandomNumberGenerator &__rand)

template<typename _InputIter , typename _Size , typename _ForwardIter >
std::pair< _InputIter, _ForwardIter >	__gnu_cxx::uninitialized_copy_n (_InputIter __first, _Size __count, _ForwardIter __result)

bitset< _Nb > &	std::bitset< _Nb >::_Unchecked_set (size_t __pos) noexcept

bitset< _Nb > &	std::bitset< _Nb >::_Unchecked_set (size_t __pos, int __val) noexcept

bitset< _Nb > &	std::bitset< _Nb >::_Unchecked_reset (size_t __pos) noexcept

bitset< _Nb > &	std::bitset< _Nb >::_Unchecked_flip (size_t __pos) noexcept

constexpr bool	std::bitset< _Nb >::_Unchecked_test (size_t __pos) const noexcept

Detailed Description

Because libstdc++ based its implementation of the STL subsections of the library on the SGI 3.3 implementation, we inherited their extensions as well.

They are additionally documented in the online documentation, a copy of which is also shipped with the library source code (in .../docs/html/documentation.html). You can also read the documentation on SGI's site, which is still running even though the code is not maintained.

NB that the following notes are pulled from various comments all over the place, so they may seem stilted.

The identity_element functions are not part of the C++ standard; SGI provided them as an extension. Its argument is an operation, and its return value is the identity element for that operation. It is overloaded for addition and multiplication, and you can overload it for your own nefarious operations.

As an extension to the binders, SGI provided composition functors and wrapper functions to aid in their creation. The unary_compose functor is constructed from two functions/functors, f and g. Calling operator() with a single argument x returns f(g(x)). The function compose1 takes the two functions and constructs a unary_compose variable for you.

binary_compose is constructed from three functors, f, g1, and g2. Its operator() returns f(g1(x),g2(x)). The function compose2 takes f, g1, and g2, and constructs the binary_compose instance for you. For example, if f returns an int, then

int answer = (compose2(f,g1,g2))(x);

__gnu_cxx::compose2

binary_compose< _Operation1, _Operation2, _Operation3 > compose2(const _Operation1 &__fn1, const _Operation2 &__fn2, const _Operation3 &__fn3)

An SGI extension .

Definition: ext/functional:164

is equivalent to

int temp1 = g1(x);
int temp2 = g2(x);
int answer = f(temp1,temp2);

But the first form is more compact, and can be passed around as a functor to other algorithms.

As an extension, SGI provided a functor called identity. When a functor is required but no operations are desired, this can be used as a pass-through. Its operator() returns its argument unchanged.

select1st and select2nd are extensions provided by SGI. Their operator()s take a std::pair as an argument, and return either the first member or the second member, respectively. They can be used (especially with the composition functors) to strip data from a sequence before performing the remainder of an algorithm.

The operator() of the project1st functor takes two arbitrary arguments and returns the first one, while project2nd returns the second one. They are extensions provided by SGI.

These three functors are each constructed from a single arbitrary variable/value. Later, their operator()s completely ignore any arguments passed, and return the stored value.

constant_void_fun's operator() takes no arguments
constant_unary_fun's operator() takes one argument (ignored)
constant_binary_fun's operator() takes two arguments (ignored)

The helper creator functions constant0, constant1, and constant2 each take a result argument and construct variables of the appropriate functor type.

Function Documentation

◆ __median() [1/2]

template<typename _Tp >

const _Tp& __gnu_cxx::__median	(	const _Tp &	__a,
		const _Tp &	__b,
		const _Tp &	__c
	)

Find the median of three values.

Parameters

__a	A value.
__b	A value.
__c	A value.

Returns: One of a, b or c.

If {l,m,n} is some convolution of {a,b,c} such that l<=m<=n then the value returned will be m. This is an SGI extension.

Definition at line 539 of file ext/algorithm.

◆ __median() [2/2]

template<typename _Tp , typename _Compare >

const _Tp& __gnu_cxx::__median	(	const _Tp &	__a,
		const _Tp &	__b,
		const _Tp &	__c,
		_Compare	__comp
	)

Find the median of three values using a predicate for comparison.

Parameters

__a	A value.
__b	A value.
__c	A value.
__comp	A binary predicate.

Returns: One of a, b or c.

If {l,m,n} is some convolution of {a,b,c} such that comp(l,m) and comp(m,n) are both true then the value returned will be m. This is an SGI extension.

Definition at line 573 of file ext/algorithm.

◆ _Find_first()

template<size_t _Nb>

size_t std::bitset< _Nb >::_Find_first ( ) const

inlinenoexcept

Finds the index of the first "on" bit.

Returns: The index of the first bit set, or size() if not found.

See also: _Find_next

Definition at line 1373 of file bitset.

◆ _Find_next()

template<size_t _Nb>

size_t std::bitset< _Nb >::_Find_next ( size_t __prev ) const

inlinenoexcept

Finds the index of the next "on" bit after prev.

Returns: The index of the next bit set, or size() if not found.

Parameters

__prev Where to start searching.

See also: _Find_first

Definition at line 334 of file ext/functional.

◆ copy_n()

template<typename _InputIterator , typename _Size , typename _OutputIterator >

std::pair<_InputIterator, _OutputIterator> __gnu_cxx::copy_n	(	_InputIterator	__first,
		_Size	__count,
		_OutputIterator	__result
	)

inline

Copies the range [first,first+count) into [result,result+count).

Parameters

__first	An input iterator.
__count	The number of elements to copy.
__result	An output iterator.

Returns: A std::pair composed of first+count and result+count.

This is an SGI extension. This inline function will boil down to a call to memmove whenever possible. Failing that, if random access iterators are passed, then the loop count will be known (and therefore a candidate for compiler optimizations such as unrolling).

Definition at line 113 of file ext/algorithm.

◆ distance()

template<typename _InputIterator , typename _Distance >

void __gnu_cxx::distance	(	_InputIterator	__first,
		_InputIterator	__last,
		_Distance &	__n
	)

inline

This is an SGI extension.

Todo:: Needs documentation! See http://gcc.gnu.org/onlinedocs/libstdc++/manual/documentation_style.html

Definition at line 105 of file ext/iterator.

◆ identity_element() [1/2]

template<class _Tp >

_Tp __gnu_cxx::identity_element ( std::multiplies< _Tp > )

inline

An SGI extension .

Definition at line 85 of file ext/functional.

◆ identity_element() [2/2]

template<class _Tp >

_Tp __gnu_cxx::identity_element ( std::plus< _Tp > )

inline

An SGI extension .

Definition at line 79 of file ext/functional.

◆ lexicographical_compare_3way()

template<typename _InputIterator1 , typename _InputIterator2 >

int __gnu_cxx::lexicographical_compare_3way	(	_InputIterator1	__first1,
		_InputIterator1	__last1,
		_InputIterator2	__first2,
		_InputIterator2	__last2
	)

memcmp on steroids.

Parameters

__first1	An input iterator.
__last1	An input iterator.
__first2	An input iterator.
__last2	An input iterator.

Returns: An int, as with memcmp.

The return value will be less than zero if the first range is lexigraphically less than the second, greater than zero if the second range is lexigraphically less than the first, and zero otherwise. This is an SGI extension.

Definition at line 194 of file ext/algorithm.

◆ power() [1/2]

template<typename _Tp , typename _Integer >

_Tp __gnu_cxx::power	(	_Tp	__x,
		_Integer	__n
	)

inline

This is an SGI extension.

Todo:: Needs documentation! See http://gcc.gnu.org/onlinedocs/libstdc++/manual/documentation_style.html

Definition at line 123 of file ext/numeric.

◆ power() [2/2]

template<typename _Tp , typename _Integer , typename _MonoidOperation >

_Tp __gnu_cxx::power	(	_Tp	__x,
		_Integer	__n,
		_MonoidOperation	__monoid_op
	)

inline

This is an SGI extension.

Todo:: Needs documentation! See http://gcc.gnu.org/onlinedocs/libstdc++/manual/documentation_style.html

Definition at line 113 of file ext/numeric.

◆ random_sample() [1/2]

template<typename _InputIterator , typename _RandomAccessIterator >

_RandomAccessIterator __gnu_cxx::random_sample	(	_InputIterator	__first,
		_InputIterator	__last,
		_RandomAccessIterator	__out_first,
		_RandomAccessIterator	__out_last
	)

inline

This is an SGI extension.

Todo:: Needs documentation! See http://gcc.gnu.org/onlinedocs/libstdc++/manual/documentation_style.html

Definition at line 381 of file ext/algorithm.

◆ random_sample() [2/2]

template<typename _InputIterator , typename _RandomAccessIterator , typename _RandomNumberGenerator >

_RandomAccessIterator __gnu_cxx::random_sample	(	_InputIterator	__first,
		_InputIterator	__last,
		_RandomAccessIterator	__out_first,
		_RandomAccessIterator	__out_last,
		_RandomNumberGenerator &	__rand
	)

inline

This is an SGI extension.

Todo:: Needs documentation! See http://gcc.gnu.org/onlinedocs/libstdc++/manual/documentation_style.html

Definition at line 404 of file ext/algorithm.

◆ random_sample_n() [1/2]

template<typename _ForwardIterator , typename _OutputIterator , typename _Distance >

_OutputIterator __gnu_cxx::random_sample_n	(	_ForwardIterator	__first,
		_ForwardIterator	__last,
		_OutputIterator	__out,
		const _Distance	__n
	)

This is an SGI extension.

Todo:: Needs documentation! See http://gcc.gnu.org/onlinedocs/libstdc++/manual/documentation_style.html

Definition at line 260 of file ext/algorithm.

◆ random_sample_n() [2/2]

template<typename _ForwardIterator , typename _OutputIterator , typename _Distance , typename _RandomNumberGenerator >

_OutputIterator __gnu_cxx::random_sample_n	(	_ForwardIterator	__first,
		_ForwardIterator	__last,
		_OutputIterator	__out,
		const _Distance	__n,
		_RandomNumberGenerator &	__rand
	)

This is an SGI extension.

Todo:: Needs documentation! See http://gcc.gnu.org/onlinedocs/libstdc++/manual/documentation_style.html

Definition at line 294 of file ext/algorithm.

◆ uninitialized_copy_n()

template<typename _InputIter , typename _Size , typename _ForwardIter >

std::pair<_InputIter, _ForwardIter> __gnu_cxx::uninitialized_copy_n	(	_InputIter	__first,
		_Size	__count,
		_ForwardIter	__result
	)

inline

Copies the range [first,last) into result.

Parameters

__first	An input iterator.
__count	Length
__result	An output iterator.

Returns: __result + (__first + __count)

Like copy(), but does not require an initialized output range.

Definition at line 121 of file ext/memory.

Classes

Functions

Detailed Description

Function Documentation

◆ __median() [1/2]

◆ __median() [2/2]

◆ _Find_first()

◆ _Find_next()

◆ _Unchecked_flip()

◆ _Unchecked_reset()

◆ _Unchecked_set() [1/2]

◆ _Unchecked_set() [2/2]

◆ _Unchecked_test()

◆ compose1()

◆ compose2()

◆ constant0()

◆ constant1()

◆ constant2()

◆ copy_n()

◆ distance()

◆ identity_element() [1/2]

◆ identity_element() [2/2]

◆ lexicographical_compare_3way()

◆ power() [1/2]

◆ power() [2/2]

◆ random_sample() [1/2]

◆ random_sample() [2/2]

◆ random_sample_n() [1/2]

◆ random_sample_n() [2/2]

◆ uninitialized_copy_n()