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Issue #13(std::variant) #21

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3509204
std::varint to imporove memory use
w3rew May 19, 2019
8199c61
Modified iterators to use std::variant
w3rew May 19, 2019
0821e8a
Modified iterators to use std::variant and updated .travis.yml to
w3rew May 19, 2019
588bb46
Merge branch 'master' of https://github.com/w3rew/Real
w3rew May 20, 2019
3ddb8c0
Fixed namespaces and std::get<index>, changed the name of the variable
w3rew May 21, 2019
7333f54
Another update to Travis
w3rew May 21, 2019
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2 changes: 1 addition & 1 deletion .travis.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,7 @@ matrix:
- wget --quiet -O - ${BOOST_URL} | tar --strip-components=1 -xz -C /tmp/boost || exit 1
- cd /tmp/boost/tools/build && ./bootstrap.sh && ./b2 install --prefix=/tmp/b2
- export PATH=/tmp/b2/bin:${PATH}
- cd /tmp/boost && b2 toolset=gcc cxxflags="-std=c++14 ${CXXFLAGS}"
- cd /tmp/boost && b2 toolset=gcc cxxflags="-std=c++17 ${CXXFLAGS}"
- os: osx
osx_image: xcode9.4
env:
Expand Down
68 changes: 41 additions & 27 deletions include/real/real.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@
#include <algorithm>
#include <initializer_list>
#include <utility>
#include <variant>

#include <real/real_exception.hpp>
#include <real/real_helpers.hpp>
Expand Down Expand Up @@ -59,12 +60,14 @@ namespace boost {

KIND _kind;

std::variant<real_explicit, real_algorithm> diff_number;
/*
// Explicit number
real_explicit _explicit_number;

// Algorithmic number
real_algorithm _algorithmic_number;

*/
// Composed number
OPERATION _operation;
real* _lhs_ptr = nullptr;
Expand Down Expand Up @@ -103,11 +106,16 @@ namespace boost {
// Internal number to iterate
real const* _real_ptr = nullptr;

std::variant<boost::real::real_explicit::const_precision_iterator,
boost::real::real_algorithm::const_precision_iterator> diff_it;

/*
// Explicit number iterator
boost::real::real_explicit::const_precision_iterator _explicit_it;

// Algorithmic number iterator
boost::real::real_algorithm::const_precision_iterator _algorithmic_it;
*/

// If the number is a composition, the const_precision_iterator uses the operand iterators
const_precision_iterator* _lhs_it_ptr = nullptr;
Expand Down Expand Up @@ -303,13 +311,15 @@ namespace boost {
switch (this->_real_ptr->_kind) {

case KIND::EXPLICIT:
this->_explicit_it = this->_real_ptr->_explicit_number.cbegin();
this->approximation_interval = this->_explicit_it.approximation_interval;
this->diff_it = std::get<real_explicit>(
this->_real_ptr->diff_number).cbegin();
this->approximation_interval = std::get<0>(this -> diff_it).approximation_interval;
break;

case KIND::ALGORITHM:
this->_algorithmic_it = this->_real_ptr->_algorithmic_number.cbegin();
this->approximation_interval = this->_algorithmic_it.approximation_interval;
this->diff_it = std::get<real_algorithm>
(this->_real_ptr->diff_number).cbegin();
this->approximation_interval = std::get<1>(this->diff_it).approximation_interval;
break;

case KIND::OPERATION:
Expand Down Expand Up @@ -339,20 +349,25 @@ namespace boost {

case KIND::EXPLICIT:
if (cend) {
this->_explicit_it = this->_real_ptr->_explicit_number.cend();
this->diff_it = std::get<real_explicit>
(this->_real_ptr->diff_number).cend();
} else {
this->_explicit_it = this->_real_ptr->_explicit_number.cbegin();
this->diff_it=
std::get<real_explicit>
(this->_real_ptr->diff_number).cbegin();
}
this->approximation_interval = this->_explicit_it.approximation_interval;
this->approximation_interval = std::get<0>(this->diff_it).approximation_interval;
break;

case KIND::ALGORITHM:
if (cend) {
this->_algorithmic_it = this->_real_ptr->_algorithmic_number.cend();
this->diff_it = std::get<real_algorithm>(
this->_real_ptr->diff_number).cend();
} else {
this->_algorithmic_it = this->_real_ptr->_algorithmic_number.cbegin();
this->diff_it = std::get<real_algorithm>
(this->_real_ptr->diff_number).cbegin();
}
this->approximation_interval = this->_algorithmic_it.approximation_interval;
this->approximation_interval = std::get<1>(this->diff_it).approximation_interval;
break;

case KIND::OPERATION:
Expand All @@ -372,13 +387,13 @@ namespace boost {
switch (this->_real_ptr->_kind) {

case KIND::EXPLICIT:
++this->_explicit_it;
this->approximation_interval = this->_explicit_it.approximation_interval;
++(std::get<0>(this->diff_it));
this->approximation_interval = std::get<0>(this->diff_it).approximation_interval;
break;

case KIND::ALGORITHM:
++this->_algorithmic_it;
this->approximation_interval = this->_algorithmic_it.approximation_interval;
++(std::get<1>(this->diff_it));
this->approximation_interval = std::get<1>(this->diff_it).approximation_interval;
break;

case KIND::OPERATION:
Expand Down Expand Up @@ -440,8 +455,7 @@ namespace boost {
*/
real(const real& other) :
_kind(other._kind),
_explicit_number(other._explicit_number),
_algorithmic_number(other._algorithmic_number),
diff_number(other.diff_number),
_operation(other._operation) { this->copy_operands(other); };

/**
Expand All @@ -454,7 +468,7 @@ namespace boost {
* @throws boost::real::invalid_string_number exception
*/
real(const std::string& number)
: _kind(KIND::EXPLICIT), _explicit_number(number) {}
: _kind(KIND::EXPLICIT), diff_number(std::in_place_type<real_explicit>, number) {}

/**
* @brief *Initializer list constructor:* Creates a boost::real::real_explicit instance
Expand All @@ -464,7 +478,7 @@ namespace boost {
* @param digits - a initializer_list<int> that represents the number digits.
*/
real(std::initializer_list<int> digits)
: _kind(KIND::EXPLICIT), _explicit_number(digits, digits.size()) {}
: _kind(KIND::EXPLICIT), diff_number(std::in_place_type<real_explicit>, digits, digits.size()) {}


/**
Expand All @@ -478,7 +492,7 @@ namespace boost {
* the number is positive, otherwise is negative.
*/
real(std::initializer_list<int> digits, bool positive)
: _kind(KIND::EXPLICIT), _explicit_number(digits, digits.size(), positive) {}
: _kind(KIND::EXPLICIT), diff_number(std::in_place_type<real_explicit>, digits, digits.size(), positive) {}

/**
* @brief *Initializer list constructor with exponent:* Creates a boost::real::real
Expand All @@ -490,7 +504,7 @@ namespace boost {
* @param exponent - an integer representing the number exponent.
*/
real(std::initializer_list<int> digits, int exponent)
: _kind(KIND::EXPLICIT), _explicit_number(digits, exponent) {};
: _kind(KIND::EXPLICIT), diff_number(std::in_place_type<real_explicit>, digits, exponent) {};

/**
* @brief *Initializer list constructor with exponent and sign:* Creates a boost::real::real instance
Expand All @@ -504,7 +518,7 @@ namespace boost {
* the number is positive, otherwise is negative.
*/
real(std::initializer_list<int> digits, int exponent, bool positive)
: _kind(KIND::EXPLICIT), _explicit_number(digits, exponent, positive) {};
: _kind(KIND::EXPLICIT), diff_number(std::in_place_type<real_explicit>, digits, exponent, positive) {};

/**
* @brief *Lambda function constructor with exponent:* Creates a boost::real::real
Expand All @@ -517,7 +531,7 @@ namespace boost {
* @param exponent - an integer representing the number exponent.
*/
real(int (*get_nth_digit)(unsigned int), int exponent)
: _kind(KIND::ALGORITHM), _algorithmic_number(get_nth_digit, exponent) {}
: _kind(KIND::ALGORITHM), diff_number(std::in_place_type<real_algorithm>, get_nth_digit, exponent) {}

/**
* @brief *Lambda function constructor with exponent and sign:* Creates a boost::real::real instance
Expand All @@ -536,7 +550,7 @@ namespace boost {
int exponent,
bool positive)
: _kind(KIND::ALGORITHM),
_algorithmic_number(get_nth_digit, exponent, positive) {}
diff_number(std::in_place_type<real_algorithm>, get_nth_digit, exponent, positive) {}

/**
* @brief *Default destructor:* If the number is an operator, the destructor destroys its operands.
Expand Down Expand Up @@ -616,11 +630,11 @@ namespace boost {
switch (this->_kind) {

case KIND::EXPLICIT:
result = this->_explicit_number[n];
result = std::get<real_explicit>(this -> diff_number)[n];
break;

case KIND::ALGORITHM:
result = this->_algorithmic_number[n];
result = std::get<real_algorithm>(this->diff_number)[n];
break;

case KIND::OPERATION:
Expand Down Expand Up @@ -729,7 +743,7 @@ namespace boost {
*/
real& operator=(const real& other) {
this->_kind = other._kind;
this->_explicit_number = other._explicit_number;
this->diff_number = other.diff_number;
this->_operation = other._operation;
this->copy_operands(other);
return *this;
Expand Down