source: source/ariba/utility/vtypes/vint.hpp@ 5308

// [The FreeBSD Licence]
//
// Copyright (c) 2008
//     Sebastian Mies, Institute of Telematics, UniversitÀt Karlsruhe (TH)
//     All rights reserved.
//
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// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
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#ifndef VINT_HPP_
#define VINT_HPP_

#include <boost/mpl/if.hpp>

#include "detail/helper.hpp"
#include "detail/vint_big.hpp"
#include "detail/vint_small.hpp"

using namespace _vint::detail;

template<size_t l, bool s> class vint;
template<size_t l, bool s>
std::ostream& operator<<(std::ostream&, const vint<l, s>& v);

/**
 * This class implements an adaptive, scalable integer type.<br />
 *
 * Key features include:<br />
 * <ul>
 *      <li>Transparent type switching according to native types</li>
 *      <li>Optimal memory consumption and optimization properties</li>
 *      <li>Automatic big integer arithmetic using gmp or other libraries</li>
 *      <li>Unconventional integer types (e.g. length not a power of 2)</li>
 *      <li>Additional math, like intervals, log2, divrem, gcd, ...</li>
 * </ul>
 *
 * ... short: a real scalable integer type at compile-time cost!<br />
 *
 * @author Sebastian Mies <mies@tm.uka.de>
 */
template<size_t __length = 0, bool __sign = false>
class vint {
        // stream operator
        friend std::ostream& operator<< <__length, __sign> (std::ostream&,
                        const vint<__length, __sign>&);

public:
        // select proper type
        typedef typename boost::mpl::if_<
                boost::mpl::bool_<(__length> 64 || __length == 0)>,
                vint_big<__length, __sign>, vint_small<__length, __sign>
                >::type type;

        // selected value type
        type value;

        // internal self-template
        typedef vint<__length, __sign> _self;

public:
        /* construct an zero integer */
        finline vint() : value() {}

        /* construct an integer from a constant */
        template<typename T> finline vint(const T v, if_integral(T) ) : value(v) {}

        /* construct a variable integer from a given string */
        finline vint(const char* text, int base = 10) : value(text,base) {}

        /* copy constructor */
        finline vint( const type& v ) {value = v;}

        /* copy constructor */
        finline vint( const _self& v ) {value = v.value;}

        //-- conversion -----------------------------------------------------------

        template<size_t ___length, bool ___sign>
        finline void convert_to(vint<___length, ___sign>& v ) const {
                return value.convert_to(v.value);
        }

        template<class T>
        finline void convert_to( T& v, if_integral(T) ) const {
                return value.convert_to(v);
        }

        finline std::string to_string(int base = 10,
                        int str_size = 0, char str_fill = '0') const {
                return value.to_string(base,str_size,str_fill);
        }

        std::string to_debug_string(int base = 10,
                        int str_size = 0, char str_fill = '0') const {
                return value.to_debug_string(base,str_size,str_fill);
        }

        //-- sub integers ---------------------------------------------------------

        finline bool get_bit(size_t index) const {
                return value.get_bit(index);
        }

        finline void set_bit(size_t index, bool v) {
                value.set_bit(index, v);
        }

        finline void set_subint(_self& v, size_t index) {
                value.set_subint(v.value,index);
        }

        finline void set_subint(uintmax_t v, size_t index) {
                value.set_subint(v,index);
        }

        finline _self get_subint(size_t index, size_t length) const {
                return value.get_subint(index,length);
        }

        finline uintmax_t get_subint(size_t index) const {
                return value.get_subint(index);
        }

        //-- assignment -----------------------------------------------------------

public:

        template<size_t _len, bool _sign>
        finline void assign( const vint<_len,_sign>& v ) {
                value.assign(v.value);
        }

        template<typename T>
        finline void assign(const T& v, if_integral(T) ) {
                value.assign(v);
        }

        finline void assign(const std::string& text, int base = 10) {
                value.assign( text, base );
        }

        void assign(const char*& text, int base = 10) {
                assign(std::string(text), base);
        }

        //-- compare operations ---------------------------------------------------

        finline int compare_to(const _self& v) const {
                return value.compare_to(v.value);
        }

        template<class T>
        finline int compare_to(const T& v, if_integral(T) ) const {
                return value.compare_to(v);
        }

        //-- arithmetic operations ------------------------------------------------

        // addition
        template<class T>
        finline void add(const T& rhs, if_integral(T) ) {value.add(rhs.value);}
        finline void add(const _self& rhs) {value.add(rhs.value);}

        // subtraction
        template<class T>
        finline void sub(const T& rhs, if_integral(T) ) {value.sub(rhs.value);}
        finline void sub(const _self& rhs) {value.sub(rhs.value);}

        // multiplication
        template<class T>
        finline void mul( const T& rhs, if_integral(T) ) {value.mul(rhs);}
        finline void mul( _self& rhs) {value.mul(rhs.value);}
        finline void mul( _self& res, const _self& rhs ) const {value.mul(res.value,rhs.value);}

        // division
        template<class T>
        finline void div( const T& rhs, if_integral(T) ) {value.div(rhs);}
        finline void div(_self& rhs) {value.div(rhs.value);}
        finline void div(_self& res, const _self& rhs ) const {value.div(res.value, rhs);}

        // modulo
        template<class T>
        finline void mod( const T& rhs, if_integral(T) ) {value.mod(rhs);}
        finline void mod(_self& rhs) {value.mod(rhs.value);}
        finline void mod(_self& res, const _self& rhs ) const {value.mod(res.value, rhs);}

        // exception of modulo: result may be of integral type
        template<class T>
        finline void mod( T& res, const T& rhs, if_integral(T) ) const {value.mod(res,rhs);}

        // division with remainder
        template<class T>
        finline void divrem(_self& res_div, T& res_rem, const T& rhs, if_integral(T) ) const {
                value.divrem(res_div.value, res_rem, rhs );
        }
        finline void divrem(_self& res_div, _self& res_rem, const _self& rhs ) const {
                value.divrem(res_div.value, res_rem.value, rhs.value);
        }
        template<class T>
        finline void divrem( T& res_rem, const T& rhs, if_integral(T) ) {
                value.div(res_rem, rhs.value);
        }
        finline void divrem( _self& res_rem, const _self& rhs ) {
                value.div(res_rem.value, rhs.value);
        }

        // logarithm to the base of 2
        finline uintmax_t log2() const {return value.log2();}

        //-- logical bit operations -----------------------------------------------

        finline void or_ (const _self& v) {value.or_(v.value);}
        finline void and_(const _self& v) {value.and_(v.value);}
        finline void xor_(const _self& v) {value.xor_(v.value);}
        finline void complement() {value.complement();}
        finline void lshift(size_t steps) {value.lshift(steps);}
        finline void rshift(size_t steps) {value.rshift(steps);}

        //-- integer dynamic ------------------------------------------------------

        inline _self normalized() const {return value.normalized();}

        //-- general information --------------------------------------------------

        finline size_t length() const {return value.length();}
        finline void set_length(size_t length) {value.set_length(length);}
        finline bool is_unspecified() {return value.is_unspecified();}

        finline _self max() const {_self v; v.value = value.max(); return v;}
        finline _self min() const {_self v; v.value = value.min(); return v;}
        finline _self zero() const {_self v; v.value = value.zero(); return v;}

        //-- general extensions ---------------------------------------------------

        finline void convert_to( std::string& str ) const {
                str = to_string();
        }

        /**
         * Returns true, if the integer is inside the interval [a,b]
         */
        finline bool is_between(const _self& a, const _self& b) const {
                return (a <= b) ?
                ((*this >= a) && (*this <= b))
                :
                ((*this <= a) && (*this >= b))
                ;
        }

        /**
         * Returns true, if the integer is inside the interval [a,b] on
         * a ring.
         */
        finline bool is_between_ring(const _self& a, const _self& b) const {
                return (b<a) ?
                (is_between(a, a.max())||is_between(b.zero(), b))
                :
                ((*this >= a) && (*this <= b))
                ;
        }

        //-- convenience operator overloads ---------------------------------------

        // conversion operators
        template<typename T> finline T convert() const {T v;convert_to(v);return v;}
        template<typename T> finline operator T () const {return convert<T>();}

        // assign operators
        template<class T>
        finline _self& operator=(const T& copy) {assign(copy);return *this;}

        // add operators
        template<class T>
        finline _self& operator+=(const T& v) {add(v);return *this;}
        template<class T>
        finline _self& operator++() {add(1);return *this;}
        template<class T>
        finline _self operator+ (const T& v) const {_self x=*this;x.add(v);return x;}

        // substract operators
        template<class T>
        finline _self& operator-=(const T& v) {sub_model(v);return *this;}
        finline _self& operator--() {sub(1);return *this;}
        template<class T>
        finline _self operator- (const T& v) const {
                _self x(*this); x.sub_model(v); return x;
        }

        // multiply operators
        template<class T> finline _self& operator*=(const T& v) {
                value.mul(v);
                return *this;
        }
        template<class T> finline _self operator*(const T& v) const {
                _self res = *this;res.mul(v); return res;
        }

        // bit shift operators convenience
        finline _self operator<< (size_t steps) {_self x=*this;return(x<<=steps);}
        finline _self& operator>>=(size_t steps) {rshift(steps);return *this;}
        finline _self operator>> (size_t steps) {_self x=*this;return(x<<=steps);}
        finline _self& operator<<=(size_t steps) {lshift(steps);return *this;}

        // bit operators convenience
        finline _self& operator&=(const _self& v) {and_(v); return *this;}
        finline _self operator & (const _self& v) {_self x=*this;return(x&=v);}
        finline _self& operator|=(const _self& v) {or_(v); return *this;}
        finline _self operator | (const _self& v) {_self x=*this;return(x|=v);}
        finline _self& operator^=(const _self& v) {xor_(v);return *this;}
        finline _self operator^ (const _self& v) {_self x=*this;return(x ^= v);}
        finline _self operator~() {_self x=*this;return x.complement();}

        // compare operators convenience
        template<class T>
        finline bool operator< (const T& v) const {return compare_to(v)< 0;}
        template<class T>
        finline bool operator> (const T& v) const {return compare_to(v)> 0;}
        template<class T>
        finline bool operator<=(const T& v) const {return compare_to(v)<=0;}
        template<class T>
        finline bool operator>=(const T& v) const {return compare_to(v)>=0;}
        template<class T>
        finline bool operator==(const T& v) const {return compare_to(v)==0;}
        template<class T>
        finline bool operator!=(const T& v) const {return compare_to(v)!=0;}
};

template<size_t l, bool s>
std::ostream& operator<<(std::ostream& os, const vint<l, s>& v) {
        return os << v.value;
}

#endif /* VINT_HPP_ */