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use_dll: simplify definition of getPowerDeriv() function using C99

master
Sébastien Villemot 2023-04-07 15:12:47 +02:00
parent b1e4884237
commit 6caf8c6c59
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1 changed files with 2 additions and 5 deletions
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7
src/DataTree.cc
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@ -893,18 +893,15 @@ void
DataTree::writeCHelpersDefinition(ostream &output) const
{
if (isBinaryOpUsed(BinaryOpcode::powerDeriv))
output << "/*" << endl
<< " * The k-th derivative of x^p" << endl
<< " */" << endl
output << "// The k-th derivative of x^p" << endl
<< "double getPowerDeriv(double x, double p, int k)" << endl
<< "{" << endl
<< " if (fabs(x) < " << power_deriv_near_zero << " && p > 0 && k > p && fabs(p-nearbyint(p)) < " << power_deriv_near_zero << ')' << endl
<< " return 0.0;" << endl
<< " else" << endl
<< " {" << endl
<< " int i = 0;" << endl
<< " double dxp = pow(x, p-k);" << endl
<< " for (; i<k; i++)" << endl
<< " for (int i = 0; i<k; i++)" << endl
<< " dxp *= p--;" << endl
<< " return dxp;" << endl
<< " }" << endl