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

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Arash Partow
2014-05-31 07:38:57 +10:00
parent 6b86ec0deb
commit 1bf1073cd8
8 changed files with 145 additions and 38 deletions
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38
exprtk_simple_example_10.cpp
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@ -39,29 +39,25 @@ void newton_sqrt()
compositor_t compositor(symbol_table);
compositor
.add("newton_sqrt_impl",
"switch "
"{ "
" case x < 0 : -inf; "
" case x == 0 : 0; "
" case x == 1 : 1; "
" default: "
" ~{ "
" z := 100; "
" y := x / 2; "
" repeat "
" y := (1 / 2) * (y + (x / y)); "
" if (equal(y * y,x)) "
" break[y]; "
" until ((z -= 1) <= 0); "
" }; "
"} ",
"x","y","z");
compositor
.add("newton_sqrt",
"newton_sqrt_impl(x,0,0)","x");
" switch "
" { "
" case x < 0 : -inf; "
" case x == 0 : 0; "
" case x == 1 : 1; "
" default: "
" ~{ "
" var z := 100; "
" var y := x / 2; "
" repeat "
" y := (1 / 2) * (y + (x / y)); "
" if (equal(y * y,x)) "
" break[y]; "
" until ((z -= 1) <= 0); "
" }; "
" } ",
"x");
std::string expression_str = "newton_sqrt(x)";