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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
/* :tabSize=4:indentSize=4:noTabs=false:folding=explicit:collapseFolds=1: */
//
// NAComparator.h: Rcpp R/C++ interface class library -- comparator
//
// Copyright (C) 2012-2014 Dirk Eddelbuettel, Romain Francois and Kevin Ushey
//
// This file is part of Rcpp.
//
// Rcpp is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// Rcpp is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Rcpp. If not, see <http://www.gnu.org/licenses/>.
#ifndef Rcpp__internal__NAComparator__h
#define Rcpp__internal__NAComparator__h
namespace Rcpp{
namespace internal {
inline int StrCmp(SEXP x, SEXP y) {
if (x == NA_STRING) return (y == NA_STRING ? 0 : 1);
if (y == NA_STRING) return -1;
if (x == y) return 0; // same string in cache
return strcmp(char_nocheck(x), char_nocheck(y));
}
template <typename T>
struct NAComparator {
inline bool operator()(T left, T right) const {
return left < right;
}
};
template <>
struct NAComparator<int> {
inline bool operator()(int left, int right) const {
if (left == NA_INTEGER) return false;
if (right == NA_INTEGER) return true;
return left < right;
}
};
template <>
struct NAComparator<double> {
inline bool operator()(double left, double right) const {
bool leftNaN = (left != left);
bool rightNaN = (right != right);
// this branch inspired by data.table: see
// https://github.com/arunsrinivasan/datatable/commit/1a3e476d3f746e18261662f484d2afa84ac7a146#commitcomment-4885242
if (Rcpp_IsNaN(right) and Rcpp_IsNA(left))
return true;
if (leftNaN != rightNaN) {
return leftNaN < rightNaN;
} else {
return left < right;
}
}
};
template <>
struct NAComparator<SEXP> {
inline bool operator()(SEXP left, SEXP right) const {
return StrCmp(left, right) < 0;
}
};
}
}
#endif
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