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

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Arash Partow
2012-04-21 09:15:01 +10:00
parent a0872d7a6d
commit a60b7646c1
2 changed files with 68 additions and 22 deletions
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34
exprtk.hpp
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@ -142,7 +142,7 @@ namespace exprtk
"floor", "for", "grad2deg", "hyp", "if", "ilike", "in", "inrange",
"like", "log", "log10", "logn", "max", "min", "mod", "mul", "nand",
"nor", "not", "not_equal", "or", "rad2deg", "root", "round", "roundn",
"sec", "shl", "shr", "sin", "sinh", "sqrt", "sum", "tan", "tanh",
"sec", "sgn", "shl", "shr", "sin", "sinh", "sqrt", "sum", "tan", "tanh",
"while", "xor"
};
static const std::size_t reserved_symbols_size = sizeof(reserved_symbols) / sizeof(std::string);
@ -447,6 +447,22 @@ namespace exprtk
return v0 << v1;
}
template <typename T>
inline T sgn_impl(const T& v, real_type_tag)
{
if (v > T(0.0)) return T(+1.0);
else if (v < T(0.0)) return T(-1.0);
else return T( 0.0);
}
template <typename T>
inline T sgn_impl(const T& v, int_type_tag)
{
if (v > T(0)) return T(+1);
else if (v < T(0)) return T(-1);
else return T( 0);
}
template <typename T>
inline T xor_impl(const T& v0, const T& v1, real_type_tag)
{
@ -546,6 +562,13 @@ namespace exprtk
return details::shl_impl(v0,v1,num_type);
}
template <typename T>
inline T sgn(const T& v)
{
typename details::number_type<T>::type num_type;
return details::sgn_impl(v,num_type);
}
template <typename T>
inline T xor_opr(const T& v0, const T& v1)
{
@ -1344,6 +1367,7 @@ namespace exprtk
e_cot ,
e_clamp ,
e_inrange,
e_sgn ,
e_r2d ,
e_d2r ,
e_d2g ,
@ -1437,6 +1461,7 @@ namespace exprtk
case e_d2g : return (arg * T(20/9));
case e_g2d : return (arg * T(9/20));
case e_not : return (arg != T(0) ? T(0) : T(1));
case e_sgn : return numeric::sgn(arg);
default : return std::numeric_limits<T>::quiet_NaN();
}
}
@ -1454,6 +1479,7 @@ namespace exprtk
case e_pos : return +arg;
case e_sqrt : return std::sqrt (arg);
case e_not : return !arg;
case e_sgn : return numeric::sgn(arg);
default : return std::numeric_limits<T>::quiet_NaN();
}
}
@ -3403,6 +3429,7 @@ namespace exprtk
operation_t( "deg2rad" , e_d2r , 1),
operation_t( "deg2grad" , e_d2g , 1),
operation_t( "grad2deg" , e_g2d , 1),
operation_t( "sgn" , e_sgn , 1),
operation_t( "not" , e_not , 1),
operation_t( "atan2", e_atan2 , 2),
operation_t( "min", e_min , 2),
@ -5418,7 +5445,10 @@ namespace exprtk
return error_node();
else
{
if (!all_nodes_valid(b))
//has the function call been completely optimized?
if (details::is_constant_node(result))
return result;
else if (!all_nodes_valid(b))
return error_node();
else if (N != f->param_count)
return error_node();