Make almost all single argument constructors `explicit`

GH #444

4 files changed, 5 insertions, 5 deletions

diff --git a/src/lib/entropy/cryptoapi_rng/es_capi.cpp b/src/lib/entropy/cryptoapi_rng/es_capi.cpp
index 8d682698a..c9d8fb7c4 100644
--- a/src/lib/entropy/cryptoapi_rng/es_capi.cpp
+++ b/src/lib/entropy/cryptoapi_rng/es_capi.cpp
@@ -19,7 +19,7 @@ namespace {
 class CSP_Handle
    {
    public:
-      CSP_Handle(u64bit capi_provider)
+      explicit CSP_Handle(u64bit capi_provider)
          {
          m_valid = false;
          DWORD prov_type = (DWORD)capi_provider;
diff --git a/src/lib/entropy/cryptoapi_rng/es_capi.h b/src/lib/entropy/cryptoapi_rng/es_capi.h
index a43d5a7f2..b1c60bfa1 100644
--- a/src/lib/entropy/cryptoapi_rng/es_capi.h
+++ b/src/lib/entropy/cryptoapi_rng/es_capi.h
@@ -27,7 +27,7 @@ class Win32_CAPI_EntropySource final : public Entropy_Source
      * Win32_Capi_Entropysource Constructor
      * @param provs list of providers, separated by ':'
      */
-      Win32_CAPI_EntropySource(const std::string& provs = "");
+      explicit Win32_CAPI_EntropySource(const std::string& provs = "");
    private:
       std::vector<u64bit> m_prov_types;
    };
diff --git a/src/lib/entropy/entropy_src.h b/src/lib/entropy/entropy_src.h
index 3bcd8c68d..539df809a 100644
--- a/src/lib/entropy/entropy_src.h
+++ b/src/lib/entropy/entropy_src.h
@@ -30,7 +30,7 @@ class BOTAN_DLL Entropy_Accumulator final
       * still be called again a few more times, and should be careful to return
       * true then as well.
       */
-      Entropy_Accumulator(std::function<bool (const byte[], size_t, double)> accum) :
+      explicit Entropy_Accumulator(std::function<bool (const byte[], size_t, double)> accum) :
          m_accum_fn(accum) {}
 
       /**
@@ -113,7 +113,7 @@ class BOTAN_DLL Entropy_Sources final
       bool poll_just(Entropy_Accumulator& accum, const std::string& src);
 
       Entropy_Sources() {}
-      Entropy_Sources(const std::vector<std::string>& sources);
+      explicit Entropy_Sources(const std::vector<std::string>& sources);
 
       ~Entropy_Sources();
    private:
diff --git a/src/lib/entropy/proc_walk/proc_walk.cpp b/src/lib/entropy/proc_walk/proc_walk.cpp
index 7ef6a8e26..c59a8227b 100644
--- a/src/lib/entropy/proc_walk/proc_walk.cpp
+++ b/src/lib/entropy/proc_walk/proc_walk.cpp
@@ -28,7 +28,7 @@ namespace {
 class Directory_Walker : public File_Descriptor_Source
    {
    public:
-      Directory_Walker(const std::string& root) :
+      explicit Directory_Walker(const std::string& root) :
          m_cur_dir(std::make_pair<DIR*, std::string>(nullptr, ""))
          {
          if(DIR* root_dir = ::opendir(root.c_str()))