bool -> int + using transform for bool -> double

Author: pachadotdev

cpp11test/src/test-integers.cpp

@@ -2,6 +2,7 @@
 #include "cpp11/doubles.hpp"
 #include "cpp11/function.hpp"
 #include "cpp11/integers.hpp"
+#include "cpp11/logicals.hpp"
 #include "cpp11/strings.hpp"
 
 #include <testthat.h>
@@ -43,6 +44,22 @@ context("integers-C++") {
     expect_true(!cpp11::is_na(na2[1]));
   }
 
+  test_that("as_integers(logicals)") {
+    cpp11::writable::logicals y;
+
+    for (int i = 0; i < 4; i++) {
+      y.push_back(i % 2 == 0);
+    }
+
+    cpp11::integers i(cpp11::as_integers(y));
+
+    expect_true(i[0] == 1);
+    expect_true(i[1] == 0);
+    expect_true(i[2] == 1);
+    expect_true(i[3] == 0);
+    expect_true(cpp11::detail::r_typeof(i) == INTSXP);
+  }
+
   test_that("integers.push_back()") {
     cpp11::writable::integers x;
     x.push_back(1);

inst/include/cpp11/doubles.hpp

@@ -8,6 +8,7 @@
 #include "cpp11/R.hpp"         // for SEXP, SEXPREC, Rf_allocVector, REAL
 #include "cpp11/as.hpp"        // for as_sexp
 #include "cpp11/protect.hpp"   // for safe
+#include "cpp11/r_bool.hpp"    // for r_bool
 #include "cpp11/r_vector.hpp"  // for vector, vector<>::proxy, vector<>::...
 #include "cpp11/sexp.hpp"      // for sexp
 
@@ -71,28 +72,26 @@ typedef r_vector<double> doubles;
 }  // namespace writable
 
 typedef r_vector<int> integers;
+typedef r_vector<r_bool> logicals;
 
 inline doubles as_doubles(SEXP x) {
   if (detail::r_typeof(x) == REALSXP) {
     return doubles(x);
-  }
-
-  else if (detail::r_typeof(x) == INTSXP) {
+  } else if (detail::r_typeof(x) == INTSXP) {
     integers xn(x);
     size_t len = xn.size();
     writable::doubles ret(len);
     std::transform(xn.begin(), xn.end(), ret.begin(), [](int value) {
       return value == NA_INTEGER ? NA_REAL : static_cast<double>(value);
     });
     return ret;
-  }
-
-  else if (detail::r_typeof(x) == LGLSXP) {
-    size_t len = Rf_xlength(x);
+  } else if (detail::r_typeof(x) == LGLSXP) {
+    logicals xn(x);
+    size_t len = xn.size();
     writable::doubles ret(len);
-    for (size_t i = 0; i < len; ++i) {
-      ret[i] = LOGICAL(x)[i] == NA_LOGICAL ? NA_REAL : static_cast<double>(LOGICAL(x)[i]);
-    }
+    std::transform(xn.begin(), xn.end(), ret.begin(), [](bool value) {
+      return value == NA_LOGICAL ? NA_REAL : static_cast<double>(value);
+    });
     return ret;
   }
 

inst/include/cpp11/integers.hpp

@@ -9,6 +9,7 @@
 #include "cpp11/as.hpp"               // for as_sexp
 #include "cpp11/attribute_proxy.hpp"  // for attribute_proxy
 #include "cpp11/protect.hpp"          // for safe
+#include "cpp11/r_bool.hpp"           // for r_bool
 #include "cpp11/r_vector.hpp"         // for r_vector, r_vector<>::proxy
 #include "cpp11/sexp.hpp"             // for sexp
 
@@ -79,6 +80,7 @@ inline int na() {
 // forward declaration
 
 typedef r_vector<double> doubles;
+typedef r_vector<r_bool> logicals;
 
 inline integers as_integers(SEXP x) {
   if (detail::r_typeof(x) == INTSXP) {
@@ -96,6 +98,14 @@ inline integers as_integers(SEXP x) {
       return static_cast<int>(value);
     });
     return ret;
+  } else if (detail::r_typeof(x) == LGLSXP) {
+    logicals xn(x);
+    size_t len = xn.size();
+    writable::integers ret(len);
+    std::transform(xn.begin(), xn.end(), ret.begin(), [](bool value) {
+      return value == NA_LOGICAL ? NA_INTEGER : static_cast<int>(value);
+    });
+    return ret;
   }
 
   throw type_error(INTSXP, detail::r_typeof(x));