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C++ Mathematical Expression Library (ExprTk) http://www.partow.net/programming/exprtk/index.html

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Arash Partow
2012-05-24 06:03:26 +10:00
parent 1b4e3d7cc2
commit 0d8601550f
2 changed files with 38 additions and 11 deletions
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39
exprtk.hpp
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@ -22,7 +22,7 @@
* (07) z:=x+sin(2*pi/y) *
* (08) u:=2*(pi*z)/(w:=x+cos(y/pi)) *
* (09) clamp(-1,sin(2*pi*x)+cos(y/2*pi),+1) *
* (10) inrange(-2,m,+2)==if(({-2<=m}and[m<=+2]),1,0) *
* (10) inrange(-2,m,+2)==if(({-2<=m} and [m<=+2]),1,0) *
* (11) (12.34sin(x)cos(2y)7+1)==(12.34*sin(x)*cos(2*y)*7+1) *
* (12) (x ilike 's*ri?g') and [y<(3z^7+w)] *
* *
@ -1945,6 +1945,18 @@ namespace exprtk
}
};
template <typename T>
inline bool is_true(const expression_node<T>* node)
{
return (T(0) != node->value());
}
template <typename T>
inline bool is_false(const expression_node<T>* node)
{
return (T(0) == node->value());
}
template <typename T>
inline bool is_unary_node(const expression_node<T>* node)
{
@ -1981,6 +1993,22 @@ namespace exprtk
return !is_variable_node(node);
}
template <typename T>
class null_node : public expression_node<T>
{
public:
inline T value() const
{
return std::numeric_limits<T>::quiet_NaN();
}
inline typename expression_node<T>::node_type type() const
{
return expression_node<T>::e_nul;
}
};
template <typename T>
class literal_node : public expression_node<T>
{
@ -2450,7 +2478,7 @@ namespace exprtk
inline T value() const
{
if (test_->value() != 0)
if (is_true(test_))
return consequent_->value();
else
return alternative_->value();
@ -2495,7 +2523,7 @@ namespace exprtk
inline T value() const
{
T result = T(0);
while (test_->value() != T(0))
while (is_true(test_))
{
result = branch_->value();
}
@ -5351,10 +5379,7 @@ namespace exprtk
inline T value() const
{
if (expression_holder_ && expression_holder_->expr)
return expression_holder_->expr->value();
else
return std::numeric_limits<T>::quiet_NaN();
return expression_holder_->expr->value();
}
inline T operator()() const