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

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Arash Partow
2015-04-28 16:50:54 +10:00
parent e39ec67df9
commit 85c094a1aa
6 changed files with 364 additions and 221 deletions
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37
exprtk_simple_example_09.cpp
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@ -28,6 +28,7 @@ void primes()
typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_t;
typedef exprtk::function_compositor<T> compositor_t;
typedef typename compositor_t::function function_t;
T x = T(0);
@ -40,43 +41,53 @@ void primes()
//Mode 1 - if statement based
compositor
.add("is_prime_impl1",
.add(
function_t(
"is_prime_impl1",
"if(y == 1,true, "
" if(0 == (x % y),false, "
" is_prime_impl1(x,y - 1)))",
"x","y");
"x","y"));
compositor
.add("is_prime1",
.add(
function_t(
"is_prime1",
"if(frac(x) != 0, false, "
" if(x <= 0, false, "
" is_prime_impl1(x,min(x - 1,trunc(sqrt(x)) + 1))))",
"x");
"x"));
//Mode 2 - switch statement based
compositor
.add("is_prime_impl2",
.add(
function_t(
"is_prime_impl2",
"switch "
"{ "
" case y == 1 : true; "
" case (x % y) == 0 : false; "
" default : is_prime_impl2(x,y - 1);"
"} ",
"x","y");
"x","y"));
compositor
.add("is_prime2",
.add(
function_t(
"is_prime2",
"switch "
"{ "
" case x <= 0 : false; "
" case frac(x) != 0 : false; "
" default : is_prime_impl2(x,min(x - 1,trunc(sqrt(x)) + 1));"
"} ",
"x");
"x"));
//Mode 3 - switch statement and while-loop based
compositor
.add("is_prime_impl3",
.add(
function_t(
"is_prime_impl3",
"while (y > 0) "
"{ "
" switch "
@ -86,17 +97,19 @@ void primes()
" default : y := y - 1; "
" } "
"} ",
"x","y");
"x","y"));
compositor
.add("is_prime3",
.add(
function_t(
"is_prime3",
"switch "
"{ "
" case x <= 0 : false; "
" case frac(x) != 0 : false; "
" default : is_prime_impl3(x,min(x - 1,trunc(sqrt(x)) + 1));"
"} ",
"x");
"x"));
std::string expression_str1 = "is_prime1(x)";
std::string expression_str2 = "is_prime2(x)";