clean up warnings from msvc

src/utils/io.h

@@ -40,7 +40,7 @@ class IStream {
    */
   template<typename T>
   inline void Write(const std::vector<T> &vec) {
-    uint64_t sz = vec.size();
+    uint64_t sz = static_cast<uint64_t>(vec.size());
     this->Write(&sz, sizeof(sz));
     if (sz != 0) {
       this->Write(&vec[0], sizeof(T) * sz);
@@ -66,7 +66,7 @@ class IStream {
    * \param str the string to be serialized
    */ 
   inline void Write(const std::string &str) {
-    uint64_t sz = str.length();
+    uint64_t sz = static_cast<uint64_t>(str.length());
     this->Write(&sz, sizeof(sz));
     if (sz != 0) {
       this->Write(&str[0], sizeof(char) * sz);

src/utils/omp.h

@@ -9,7 +9,11 @@
 #include <omp.h>
 #else
 #ifndef DISABLE_OPENMP
+#ifndef _MSC_VER
 #warning "OpenMP is not available, compile to single thread code"
+#else
+// TODO add warning for msvc
+#endif
 #endif
 inline int omp_get_thread_num() { return 0; }
 inline int omp_get_num_threads() { return 1; }

src/utils/random.h

@@ -88,11 +88,18 @@ inline void Shuffle(std::vector<T> &data) {
 struct Random{
   /*! \brief set random number seed */
   inline void Seed(unsigned sd) {
-    this->rseed = sd;
+	 this->rseed = sd;
+#ifdef _MSC_VER
+    srand(rseed);
+#endif
   }
   /*! \brief return a real number uniform in [0,1) */
   inline double RandDouble(void) {
-    return static_cast<double>( rand_r( &rseed ) ) / (static_cast<double>( RAND_MAX )+1.0);
+#ifndef _MSC_VER
+    return static_cast<double>(rand_r(&rseed)) / (static_cast<double>(RAND_MAX) + 1.0);
+#else
+     return static_cast<double>(rand()) / (static_cast<double>(RAND_MAX) + 1.0);
+#endif
   }
   // random number seed
   unsigned rseed;

src/utils/utils.h

@@ -6,8 +6,19 @@
  * \author Tianqi Chen
  */
 #define _CRT_SECURE_NO_WARNINGS
+#include <cstdio>
+#include <cstdarg>
+#include <cstdlib>
 #ifdef _MSC_VER
 #define fopen64 fopen
+// temporal solution for MSVC
+inline int snprintf(char *ptr, size_t sz, const char *fmt, ...) {
+  va_list args;
+  va_start(args, fmt);
+  int ret = vsprintf(ptr, fmt, args);
+  va_end(args);
+  return ret;
+}
 #else
 #ifdef _FILE_OFFSET_BITS
 #if _FILE_OFFSET_BITS == 32
@@ -36,11 +47,6 @@ typedef long int64_t;
 #include <inttypes.h>
 #endif
 
-
-#include <cstdio>
-#include <cstdarg>
-#include <cstdlib>
-
 namespace xgboost {
 /*! \brief namespace for helper utils of the project */
 namespace utils {