Subzero: Improve class definition hygiene.

src/IceTypeConverter.h

 //===- subzero/src/IceTypeConverter.h - Convert ICE/LLVM Types --*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file defines how to convert LLVM types to ICE types, and ICE types
@@ skipping 10 matching lines @@
 #include "IceTypes.h"
 
 namespace llvm {
 class LLVMContext;
 } // end of llvm namespace.
 
 namespace Ice {
 
 /// Converts LLVM types to ICE types, and ICE types to LLVM types.
 class TypeConverter {
+  TypeConverter() = delete;
   TypeConverter(const TypeConverter &) = delete;
   TypeConverter &operator=(const TypeConverter &) = delete;
 
 public:
   /// Context is the context to use to build llvm types.
-  TypeConverter(llvm::LLVMContext &Context);
+  explicit TypeConverter(llvm::LLVMContext &Context);
 
   /// Converts LLVM type LLVMTy to an ICE type. Returns
   /// Ice::IceType_NUM if unable to convert.
   Type convertToIceType(llvm::Type *LLVMTy) const {
     auto Pos = LLVM2IceMap.find(LLVMTy);
     if (Pos == LLVM2IceMap.end())
       return convertToIceTypeOther(LLVMTy);
     return Pos->second;
   }
 
 private:
   // The mapping from LLVM types to corresopnding Ice types.
   std::map<llvm::Type *, Type> LLVM2IceMap;
 
   // Add LLVM/ICE pair to internal tables.
   void addLLVMType(Type Ty, llvm::Type *LLVMTy);
 
   // Converts types not in LLVM2IceMap.
   Type convertToIceTypeOther(llvm::Type *LLVMTy) const;
 };
 
 } // end of Ice namespace.
 
 #endif // SUBZERO_SRC_ICETYPECONVERTER_H