uspecial.h

// This file is part of the uSTL library, an STL implementation.
//
// Copyright (c) 2005 by Mike Sharov <msharov@users.sourceforge.net>
// This file is free software, distributed under the MIT License.

#pragma once
#include "uvector.h"
#include "ustring.h"
#include "uset.h"
#include "umultiset.h"
#include "ubitset.h"
#include "ulaalgo.h"
#include "uarray.h"
#include "uctralgo.h"
#include "ufunction.h"
#include "uctrstrm.h"
#include "sistream.h"
#include "uchrono.h"

namespace ustl {

//----------------------------------------------------------------------
// Alogrithm specializations not in use by the library code.
//----------------------------------------------------------------------

template <> inline constexpr void swap (cmemlink& a, cmemlink& b)	{ a.swap (b); }
template <> inline constexpr void swap (memlink& a, memlink& b)		{ a.swap (b); }
template <> inline constexpr void swap (memblock& a, memblock& b)	{ a.swap (b); }
template <> inline constexpr void swap (string& a, string& b)		{ a.swap (b); }
#define TEMPLATE_SWAP_PSPEC(type, template_decl)	\
template_decl inline constexpr void swap (type& a, type& b) { a.swap (b); }
TEMPLATE_SWAP_PSPEC (TEMPLATE_TYPE1 (vector,T),		TEMPLATE_DECL1 (T))
TEMPLATE_SWAP_PSPEC (TEMPLATE_TYPE1 (set,T),		TEMPLATE_DECL1 (T))
TEMPLATE_SWAP_PSPEC (TEMPLATE_TYPE1 (multiset,T),	TEMPLATE_DECL1 (T))
TEMPLATE_SWAP_PSPEC (TEMPLATE_TYPE2 (tuple,N,T),	TEMPLATE_FULL_DECL2 (size_t,N,typename,T))

//----------------------------------------------------------------------
// Streamable definitions. Not used in the library and require streams.
//----------------------------------------------------------------------

//----{ pair }----------------------------------------------------------

/// \brief Reads pair \p p from stream \p is.
template <typename T1, typename T2>
void pair<T1,T2>::read (istream& is)
{
    is >> first;
    is.align (stream_align_of(second));
    is >> second;
    is.align (stream_align_of(first));
}

/// Writes pair \p p to stream \p os.
template <typename T1, typename T2>
void pair<T1,T2>::write (ostream& os) const
{
    os << first;
    os.align (stream_align_of(second));
    os << second;
    os.align (stream_align_of(first));
}

/// Returns the written size of the object.
template <typename T1, typename T2>
constexpr size_t pair<T1,T2>::stream_size (void) const
{
    return Align (stream_size_of(first), stream_align_of(second)) +
	    Align (stream_size_of(second), stream_align_of(first));
}

/// Writes pair \p p to stream \p os.
template <typename T1, typename T2>
void pair<T1,T2>::text_write (ostringstream& os) const
{
    os << '(' << first << ',' << second << ')';
}

/// \brief Takes a pair and returns pair.first
/// This is an extension, available in uSTL and the SGI STL.
template <typename Pair> struct select1st : public unary_function<Pair,typename Pair::first_type> {
    using result_type = typename Pair::first_type;
    inline const result_type&	operator()(const Pair& a) const { return a.first; }
    inline result_type&		operator()(Pair& a) const { return a.first; }
};

/// \brief Takes a pair and returns pair.second
/// This is an extension, available in uSTL and the SGI STL.
template <typename Pair> struct select2nd : public unary_function<Pair,typename Pair::second_type> {
    using result_type = typename Pair::second_type;
    inline const result_type&	operator()(const Pair& a) const { return a.second; }
    inline result_type&		operator()(Pair& a) const { return a.second; }
};

/// \brief Converts a const_iterator pair into an iterator pair
/// Useful for converting pair ranges returned by equal_range, for instance.
/// This is an extension, available in uSTL.
template <typename Container>
inline pair<typename Container::iterator, typename Container::iterator>
unconst (const pair<typename Container::const_iterator, typename Container::const_iterator>& i, Container&)
{
    using unconst_pair_t = pair<typename Container::iterator, typename Container::iterator>;
    return *noalias_cast<unconst_pair_t*>(&i);
}

//----{ vector }--------------------------------------------------------

template <typename T>
inline size_t stream_align_of (const vector<T>&)
{
    using written_size_type = typename vector<T>::written_size_type;
    return stream_align_of (written_size_type());
}

//----{ bitset }--------------------------------------------------------

/// Writes bitset \p v into stream \p os.
template <size_t Size>
void bitset<Size>::text_read (istringstream& is)
{
    char c;
    for (int i = Size; --i >= 0 && (is >> c).good();)
	set (i, c == '1');
}

//----{ tuple }---------------------------------------------------------

template <size_t N, typename T>
struct numeric_limits<tuple<N,T> > {
    using value_limits = numeric_limits<T>;
    static inline tuple<N,T> min (void)	{ tuple<N,T> v; fill (v, value_limits::min()); return v; }
    static inline tuple<N,T> max (void)	{ tuple<N,T> v; fill (v, value_limits::max()); return v; }
    static const bool is_signed = value_limits::is_signed;
    static const bool is_integer = value_limits::is_integer;
    static const bool is_integral = value_limits::is_integral;
};

template <size_t N, typename T>
inline size_t stream_align_of (const tuple<N,T>&) { return stream_align_of (NullValue<T>()); }

template <typename T, typename IntT>
inline ostringstream& chartype_text_write (ostringstream& os, const T& v)
{
    os.format (_FmtPrtChr[!isprint(v)], v);
    return os;
}

template <>
inline ostringstream& container_element_text_write (ostringstream& os, const uint8_t& v)
{ return chartype_text_write<uint8_t, unsigned int> (os, v); }
template <>
inline ostringstream& container_element_text_write (ostringstream& os, const int8_t& v)
{ return chartype_text_write<int8_t, int> (os, v); }

//----{ matrix }--------------------------------------------------------

/// Writes matrix \p v into stream \p os.
template <size_t NX, size_t NY, typename T>
void matrix<NX,NY,T>::text_write (ostringstream& os) const
{
    os << '(';
    for (uoff_t iRow = 0; iRow < NY; ++ iRow) {
	os << '(';
        for (uoff_t iColumn = 0; iColumn < NX; ++iColumn)
	    os << at(iRow)[iColumn] << ",)"[iColumn == NX-1];
    }
    os << ')';
}

//----{ long4grain }----------------------------------------------------

#if SIZE_OF_LONG == 8
// Helper class for long4grain and ptr4grain wrappers.
class _long4grain {
public:
    inline	_long4grain (uint64_t v)	: _v (v) {}
#if __x86_64__
    inline void	read (istream& is)
    {
	assert (is.aligned(4));
	#if WANT_BSTREAM_EXCEPTIONS
	    if (!is.verify_remaining ("read", "long4grain", sizeof(_v))) return;
	#else
	    assert (is.remaining() >= sizeof(_v));
	#endif
	_v = *reinterpret_cast<const uint64_t*>(is.ipos());
	is.skip (sizeof(_v));
    }
    inline void	write (ostream& os) const
    {
	assert (os.aligned(4));
	#if WANT_BSTREAM_EXCEPTIONS
	    if (!os.verify_remaining ("write", "long4grain", sizeof(_v))) return;
	#else
	    assert (os.remaining() >= sizeof(_v));
	#endif
	*reinterpret_cast<uint64_t*>(os.ipos()) = _v;
	os.skip (sizeof(_v));
    }
#elif USTL_BYTE_ORDER == USTL_BIG_ENDIAN
    inline void	read (istream& is)		{ uint32_t vl, vh; is >> vh >> vl; _v = (uint64_t(vh) << 32) | uint64_t(vl); }
    inline void	write (ostream& os) const	{ os << uint32_t(_v >> 32) << uint32_t(_v); }
#else
    inline void	read (istream& is)		{ uint32_t vl, vh; is >> vl >> vh; _v = (uint64_t(vh) << 32) | uint64_t(vl); }
    inline void	write (ostream& os) const	{ os << uint32_t(_v) << uint32_t(_v >> 32); }
#endif
    inline size_t stream_size (void) const	{ return stream_size_of(_v); }
private:
    uint64_t	_v;
};

/// Wrap long values to allow writing them on 4-grain even on 64bit platforms.
inline _long4grain& long4grain (unsigned long& v)		{ asm("":"+m"(v)); return *noalias_cast<_long4grain*>(&v); }
/// Wrap long values to allow writing them on 4-grain even on 64bit platforms.
inline const _long4grain long4grain (const unsigned long& v)	{ return _long4grain(v); }
/// Wrap pointer values to allow writing them on 4-grain even on 64bit platforms.
template <typename T>
inline _long4grain& ptr4grain (T*& p)				{ asm("":"+m"(p)); return *noalias_cast<_long4grain*>(&p); }
/// Wrap pointer values to allow writing them on 4-grain even on 64bit platforms.
template <typename T>
inline const _long4grain ptr4grain (const T* const& p)		{ return _long4grain(uintptr_t(p)); }
#else	// if not SIZE_OF_LONG == 8
inline unsigned long& long4grain (unsigned long& v)		{ return v; }
inline const unsigned long& long4grain (const unsigned long& v)	{ return v; }
template <typename T> inline T*& ptr4grain (T*& p)		{ return p; }
template <typename T> inline const T* const& ptr4grain (const T* const& p) { return p; }
#endif	// SIZE_OF_LONG == 8

//----------------------------------------------------------------------

} // namespace ustl

#if SIZE_OF_LONG == 8
ALIGNOF (ustl::_long4grain, 4)
#endif
ALIGNOF (ustl::CBacktrace, sizeof(void*))
ALIGNOF (ustl::string, stream_align_of (string::value_type()))
// bool is a big type on some machines (like DEC Alpha), so it's written as a byte.
ALIGNOF(bool, sizeof(uint8_t))
CAST_STREAMABLE(bool, uint8_t)