create stream

Author: zhiics

src/runtime/vm/executable.cc

@@ -168,7 +168,8 @@ std::string Executable::Stats() const {
 
 TVMByteArray Executable::Save() {
   // Initialize the stream object.
-  strm_ = new dmlc::MemoryStringStream(&code_);
+  dmlc::MemoryStringStream strm(const_cast<std::string*>(&code_));
+  strm_ = &strm;
 
   uint64_t header = kTVMVMBytecodeMagic;
   strm_->Write(header);
@@ -407,10 +408,8 @@ runtime::Module Executable::Load(const std::string& code, const runtime::Module
   std::shared_ptr<Executable> exec = std::make_shared<Executable>();
   exec->code_ = code;
   exec->lib = lib;
-  // Initialize the stream object.
-  if (exec->strm_ == nullptr) {
-    exec->strm_ = new dmlc::MemoryStringStream(&exec->code_);
-  }
+  dmlc::MemoryStringStream strm(const_cast<std::string*>(&code));
+  exec->strm_ = &strm;
 
   // Check header.
   uint64_t header;