fix windows compile bug

test=develop

paddle/fluid/framework/ddim.cc

@@ -62,7 +62,8 @@ struct DDimPlusVisitor {
 
 DDim DDim::operator+(const DDim& d) const {
   PADDLE_ENFORCE(rank_ == d.rank_);
-  DDim ret(rank_);
+  DDim ret;
+  ret.rank_ = rank_;
   ret.apply_visitor(DDimPlusVisitor(Get(), d.Get()));
   return ret;
 }
@@ -82,7 +83,8 @@ struct DDimMulVisitor {
 
 DDim DDim::operator*(const DDim& d) const {
   PADDLE_ENFORCE(rank_ == d.rank_);
-  DDim ret(rank_);
+  DDim ret;
+  ret.rank_ = rank_;
   ret.apply_visitor(DDimMulVisitor(Get(), d.Get()));
   return ret;
 }
@@ -121,7 +123,9 @@ int64_t product(const DDim& ddim) {
 DDim slice_ddim(const DDim& dim, int begin, int end) {
   PADDLE_ENFORCE(begin >= 0,
                  "Begin index can't be less than zero in ddim slice.");
-  DDim ret(end - begin);
+  int len = end - begin;
+  DDim ret;
+  ret.rank_ = len;
   dynamic_dim_assign(dim.Get() + begin, ret.GetMutable(), ret.rank_);
   return ret;
 }
@@ -156,7 +160,8 @@ DDim flatten_to_2d(const DDim& src, int num_col_dims) {
 DDim flatten_to_1d(const DDim& src) { return make_ddim({product(src)}); }
 
 DDim stride(const DDim& ddim) {
-  DDim strides(ddim.size());
+  DDim strides;
+  strides.rank_ = ddim.size();
   strides[ddim.size() - 1] = 1;
   for (int i = ddim.size() - 2; i >= 0; --i) {
     strides[i] = strides[i + 1] * ddim[i + 1];
@@ -165,7 +170,8 @@ DDim stride(const DDim& ddim) {
 }
 
 DDim stride_numel(const DDim& ddim) {
-  DDim strides(ddim.size());
+  DDim strides;
+  strides.rank_ = ddim.size();
   strides[ddim.size() - 1] = ddim[ddim.size() - 1];
   for (int i = ddim.size() - 2; i >= 0; --i) {
     strides[i] = strides[i + 1] * ddim[i];

paddle/fluid/framework/ddim.h

@@ -136,12 +136,6 @@ class DDim {
     return *reinterpret_cast<const Dim<M>*>(p);
   }
 
-  // Construct DDim with given rank
-  // Only used in friend functions
-  explicit DDim(int rank) : rank_(rank) {
-    PADDLE_ENFORCE(rank_ >= 0 && rank_ < kMaxRank, "Invalid rank %d", rank);
-  }
-
   friend DDim slice_ddim(const DDim& dim, int begin, int end);
   friend DDim stride(const DDim& ddim);
   friend DDim stride_numel(const DDim& ddim);