3 files changed, 6 insertions, 4 deletions
diff --git a/libdevcore/Common.h b/libdevcore/Common.h
index c5b09a80..9d6dd408 100644
--- a/libdevcore/Common.h
+++ b/libdevcore/Common.h
@@ -44,7 +44,6 @@
 #include <unordered_set>
 #include <functional>
 #include <string>
-#include <chrono>
 
 #if defined(__GNUC__)
 #pragma warning(push)
@@ -158,7 +157,7 @@ template <> inline u256 exp10<0>()
 class ScopeGuard
 {
 public:
-	ScopeGuard(std::function<void(void)> _f): m_f(_f) {}
+	explicit ScopeGuard(std::function<void(void)> _f): m_f(_f) {}
 	~ScopeGuard() { m_f(); }
 
 private:
diff --git a/libdevcore/CommonData.h b/libdevcore/CommonData.h
index 6f40d7be..0321011e 100644
--- a/libdevcore/CommonData.h
+++ b/libdevcore/CommonData.h
@@ -184,7 +184,8 @@ template <class T>
 inline std::vector<T> operator+(std::vector<T> const& _a, std::vector<T> const& _b)
 {
 	std::vector<T> ret(_a);
-	return ret += _b;
+	ret += _b;
+	return ret;
 }
 
 template <class T, class V>
diff --git a/libdevcore/FixedHash.h b/libdevcore/FixedHash.h
index 5b1c7acf..141e9ffd 100644
--- a/libdevcore/FixedHash.h
+++ b/libdevcore/FixedHash.h
@@ -27,6 +27,7 @@
 #include <cstdint>
 #include <algorithm>
 #include <boost/functional/hash.hpp>
+#include <boost/io/ios_state.hpp>
 #include "CommonData.h"
 
 namespace dev
@@ -59,7 +60,7 @@ public:
 	enum ConstructFromHashType { AlignLeft, AlignRight, FailIfDifferent };
 
 	/// Construct an empty hash.
-	FixedHash() { m_data.fill(0); }
+	explicit FixedHash() { m_data.fill(0); }
 
 	/// Construct from another hash, filling with zeroes or cropping as necessary.
 	template <unsigned M> explicit FixedHash(FixedHash<M> const& _h, ConstructFromHashType _t = AlignLeft) { m_data.fill(0); unsigned c = std::min(M, N); for (unsigned i = 0; i < c; ++i) m_data[_t == AlignRight ? N - 1 - i : i] = _h[_t == AlignRight ? M - 1 - i : i]; }
@@ -224,6 +225,7 @@ template<> inline size_t FixedHash<32>::hash::operator()(FixedHash<32> const& va
 template <unsigned N>
 inline std::ostream& operator<<(std::ostream& _out, FixedHash<N> const& _h)
 {
+	boost::io::ios_all_saver guard(_out);
 	_out << std::noshowbase << std::hex << std::setfill('0');
 	for (unsigned i = 0; i < N; ++i)
 		_out << std::setw(2) << (int)_h[i];