Adjust includes in sample.h, Date.h, and Datetime.h for MinGW

Author: nathan-russell

ChangeLog

@@ -1,3 +1,11 @@
+2016-12-13  Nathan Russell     <[email protected]>
+
+        * inst/include/Rcpp/sugar/functions/sample.h: Use malloc.h instead of 
+        alloca.h when building on Windows
+        * inst/include/Rcpp/date_datetime/Date.h: Include time.h when building 
+        on Windows
+        * inst/include/Rcpp/date_datetime/Datetime.h: Idem
+
 2016-12-12  Dirk Eddelbuettel  <[email protected]>
 
         * inst/include/Rcpp/sugar/functions/sample.h: In case sample.h from the

inst/include/Rcpp/date_datetime/Date.h

@@ -22,6 +22,10 @@
 #ifndef Rcpp__Date_h
 #define Rcpp__Date_h
 
+#if defined(WIN32) || defined(__WIN32) || defined(__WIN32__)
+#include <time.h>
+#endif
+
 namespace Rcpp {
 
     class Date {

inst/include/Rcpp/date_datetime/Datetime.h

@@ -24,6 +24,10 @@
 
 #include <RcppCommon.h>
 
+#if defined(WIN32) || defined(__WIN32) || defined(__WIN32__)
+#include <time.h>
+#endif
+
 namespace Rcpp {
 
     class Datetime {

inst/include/Rcpp/sugar/functions/sample.h

@@ -26,7 +26,11 @@
 #ifndef Rcpp__sugar__sample_h
 #define Rcpp__sugar__sample_h
 
+#if defined(WIN32) || defined(__WIN32) || defined(__WIN32__)
+#include <malloc.h>
+#else
 #include <alloca.h>
+#endif 
 
 //  In order to mirror the behavior of `base::sample` 
 //  as closely as possible, this file contains adaptations