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

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This commit is contained in:
Arash Partow
2016-09-01 09:21:23 +10:00
parent ed5eec1836
commit e0b0aa5130
4 changed files with 110 additions and 33 deletions
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66
exprtk_simple_example_09.cpp
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@ -44,18 +44,18 @@ void primes()
.add(
function_t(
"is_prime_impl1",
"if (y == 1,true, "
" if (0 == (x % y),false, "
" is_prime_impl1(x,y - 1)))",
" if (y == 1,true, "
" if (0 == (x % y),false, "
" is_prime_impl1(x,y - 1))) ",
"x","y"));
compositor
.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))))",
" if (frac(x) != 0, false, "
" if (x <= 0, false, "
" is_prime_impl1(x,min(x - 1,trunc(sqrt(x)) + 1)))) ",
"x"));
//Mode 2 - switch statement based
@ -63,24 +63,24 @@ void primes()
.add(
function_t(
"is_prime_impl2",
"switch "
"{ "
" case y == 1 : true; "
" case (x % y) == 0 : false; "
" default : is_prime_impl2(x,y - 1);"
"} ",
" switch "
" { "
" case y == 1 : true; "
" case (x % y) == 0 : false; "
" default : is_prime_impl2(x,y - 1); "
" } ",
"x","y"));
compositor
.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));"
"} ",
" switch "
" { "
" case x <= 0 : false; "
" case frac(x) != 0 : false; "
" default : is_prime_impl2(x,min(x - 1,trunc(sqrt(x)) + 1)); "
" } ",
"x"));
//Mode 3 - switch statement and while-loop based
@ -88,27 +88,27 @@ void primes()
.add(
function_t(
"is_prime_impl3",
"while (y > 0) "
"{ "
" switch "
" { "
" case y == 1 : ~(y := 0,true); "
" case (x % y) == 0 : ~(y := 0,false);"
" default : y := y - 1; "
" } "
"} ",
" while (y > 0) "
" { "
" switch "
" { "
" case y == 1 : ~(y := 0,true); "
" case (x % y) == 0 : ~(y := 0,false); "
" default : y := y - 1; "
" } "
" } ",
"x","y"));
compositor
.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));"
"} ",
" switch "
" { "
" case x <= 0 : false; "
" case frac(x) != 0 : false; "
" default : is_prime_impl3(x,min(x - 1,trunc(sqrt(x)) + 1)); "
" } ",
"x"));
std::string expression_str1 = "is_prime1(x)";