6 files changed, 13 insertions, 13 deletions
diff --git a/apt-pkg/contrib/configuration.h b/apt-pkg/contrib/configuration.h
index 2a3ae1aa4..b5dfe721f 100644
--- a/apt-pkg/contrib/configuration.h
+++ b/apt-pkg/contrib/configuration.h
@@ -119,7 +119,7 @@ class Configuration
    void Dump(std::ostream& str, char const * const root,
 	     char const * const format, bool const emptyValue);
 
-   Configuration(const Item *Root);
+   explicit Configuration(const Item *Root);
    Configuration();
    ~Configuration();
 
@@ -130,7 +130,7 @@ class Configuration
      APT_HIDDEN void clearPatterns();
 
    public:
-     MatchAgainstConfig(char const * Config);
+     explicit MatchAgainstConfig(char const * Config);
      virtual ~MatchAgainstConfig();
 
      /** \brief Returns \b true for a string matching one of the patterns */
diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index 3b4a4a10c..8d6cb3146 100644
--- a/apt-pkg/contrib/fileutl.cc
+++ b/apt-pkg/contrib/fileutl.cc
@@ -1944,7 +1944,7 @@ class APT_HIDDEN LzmaFileFdPrivate: public FileFdPrivate {				/*{{{*/
       bool eof;
       bool compressing;
 
-      LZMAFILE(FileFd * const fd) : file(nullptr), filefd(fd), eof(false), compressing(false) { buffer[0] = '\0'; }
+      explicit LZMAFILE(FileFd * const fd) : file(nullptr), filefd(fd), eof(false), compressing(false) { buffer[0] = '\0'; }
       ~LZMAFILE()
       {
 	 if (compressing == true && filefd->Failed() == false)
diff --git a/apt-pkg/contrib/hashes.h b/apt-pkg/contrib/hashes.h
index 9ef2945d7..c636852ec 100644
--- a/apt-pkg/contrib/hashes.h
+++ b/apt-pkg/contrib/hashes.h
@@ -47,7 +47,7 @@ class HashString
 
  public:
    HashString(std::string Type, std::string Hash);
-   HashString(std::string StringedHashString);  // init from str as "type:hash"
+   explicit HashString(std::string StringedHashString);  // init from str as "type:hash"
    HashString();
 
    // get hash type used
@@ -163,11 +163,11 @@ class HashStringList
    HashStringList() {}
 
    // simplifying API-compatibility constructors
-   HashStringList(std::string const &hash) {
+   explicit HashStringList(std::string const &hash) {
       if (hash.empty() == false)
 	 list.push_back(HashString(hash));
    }
-   HashStringList(char const * const hash) {
+   explicit HashStringList(char const * const hash) {
       if (hash != NULL && hash[0] != '\0')
 	 list.push_back(HashString(hash));
    }
@@ -210,9 +210,9 @@ class Hashes
     * which hashes to generate. */
    Hashes();
    /** @param Hashes bitflag composed of #SupportedHashes */
-   Hashes(unsigned int const Hashes);
+   explicit Hashes(unsigned int const Hashes);
    /** @param Hashes is a list of hashes */
-   Hashes(HashStringList const &Hashes);
+   explicit Hashes(HashStringList const &Hashes);
    virtual ~Hashes();
 };
 
diff --git a/apt-pkg/contrib/mmap.h b/apt-pkg/contrib/mmap.h
index 63d54d27c..3af1f47fb 100644
--- a/apt-pkg/contrib/mmap.h
+++ b/apt-pkg/contrib/mmap.h
@@ -74,7 +74,7 @@ class MMap
    bool Sync(unsigned long Start,unsigned long Stop);
    
    MMap(FileFd &F,unsigned long Flags);
-   MMap(unsigned long Flags);
+   explicit MMap(unsigned long Flags);
    virtual ~MMap();
 };
 
diff --git a/apt-pkg/contrib/progress.h b/apt-pkg/contrib/progress.h
index 4406a388b..903e6613e 100644
--- a/apt-pkg/contrib/progress.h
+++ b/apt-pkg/contrib/progress.h
@@ -80,9 +80,9 @@ class OpTextProgress : public OpProgress
 
    virtual void Done() APT_OVERRIDE;
    
-   OpTextProgress(bool NoUpdate = false) : NoUpdate(NoUpdate), 
+   explicit OpTextProgress(bool NoUpdate = false) : NoUpdate(NoUpdate),
                 NoDisplay(false), LastLen(0) {};
-   OpTextProgress(Configuration &Config);
+   explicit OpTextProgress(Configuration &Config);
    virtual ~OpTextProgress() {Done();};
 };
 
diff --git a/apt-pkg/contrib/strutl.h b/apt-pkg/contrib/strutl.h
index c25ce8054..ae0aaedf9 100644
--- a/apt-pkg/contrib/strutl.h
+++ b/apt-pkg/contrib/strutl.h
@@ -218,8 +218,8 @@ class URI
    static std::string SiteOnly(const std::string &URI);
    static std::string ArchiveOnly(const std::string &URI);
    static std::string NoUserPassword(const std::string &URI);
-   
-   URI(std::string Path) {CopyFrom(Path);}
+
+   explicit URI(std::string Path) { CopyFrom(Path); }
    URI() : Port(0) {}
 };