Add explicit keywords.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47382 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 6 insertions, 4 deletions

diff --git a/include/llvm/Support/Annotation.h b/include/llvm/Support/Annotation.h
index 4a53ff59a9..2be1c10616 100644
--- a/include/llvm/Support/Annotation.h
+++ b/include/llvm/Support/Annotation.h
@@ -43,7 +43,9 @@ class AnnotationID {
   unsigned ID;
 
   AnnotationID();                             // Default ctor is disabled
-  inline AnnotationID(unsigned i) : ID(i) {}  // Only creatable from AnnMgr
+
+  // AnnotationID is only creatable from AnnMgr.
+  explicit inline AnnotationID(unsigned i) : ID(i) {}
 public:
   inline AnnotationID(const AnnotationID &A) : ID(A.ID) {}
 
@@ -67,7 +69,7 @@ class Annotation {
   AnnotationID ID;         // ID number, as obtained from AnnotationManager
   Annotation *Next;        // The next annotation in the linked list
 public:
-  inline Annotation(AnnotationID id) : ID(id), Next(0) {}
+  explicit inline Annotation(AnnotationID id) : ID(id), Next(0) {}
   virtual ~Annotation();  // Designed to be subclassed
 
   // getID - Return the unique ID# of this annotation
diff --git a/include/llvm/Support/CommandLine.h b/include/llvm/Support/CommandLine.h
index 1392e334ac..0f804395c3 100644
--- a/include/llvm/Support/CommandLine.h
+++ b/include/llvm/Support/CommandLine.h
@@ -1316,7 +1316,7 @@ struct aliasopt {
 // exit is called.
 struct extrahelp {
   const char * morehelp;
-  extrahelp(const char* help);
+  explicit extrahelp(const char* help);
 };
 
 void PrintVersionMessage();
diff --git a/include/llvm/Support/ConstantRange.h b/include/llvm/Support/ConstantRange.h
index 6fb56b3b25..2e477cf899 100644
--- a/include/llvm/Support/ConstantRange.h
+++ b/include/llvm/Support/ConstantRange.h
@@ -44,7 +44,7 @@ class ConstantRange {
  public:
   /// Initialize a full (the default) or empty set for the specified bit width.
   ///
-  ConstantRange(uint32_t BitWidth, bool isFullSet = true);
+  explicit ConstantRange(uint32_t BitWidth, bool isFullSet = true);
 
   /// Initialize a range to hold the single specified value.
   ///