Add a load of explicit keywords.

47 files changed, 64 insertions, 63 deletions

diff --git a/src/lib/audio_analysis.h b/src/lib/audio_analysis.h
index a8ef4fb2d..6da651c95 100644
--- a/src/lib/audio_analysis.h
+++ b/src/lib/audio_analysis.h
@@ -37,8 +37,8 @@ class Playlist;
 class AudioAnalysis : public boost::noncopyable
 {
 public:
-	AudioAnalysis (int c);
-	AudioAnalysis (boost::filesystem::path);
+	explicit AudioAnalysis (int c);
+	explicit AudioAnalysis (boost::filesystem::path);
 
 	void add_point (int c, AudioPoint const & p);
 
diff --git a/src/lib/audio_buffers.h b/src/lib/audio_buffers.h
index f4a0c1f1c..64ad4ba95 100644
--- a/src/lib/audio_buffers.h
+++ b/src/lib/audio_buffers.h
@@ -40,7 +40,7 @@ class AudioBuffers
 public:
 	AudioBuffers (int channels, int32_t frames);
 	AudioBuffers (AudioBuffers const &);
-	AudioBuffers (boost::shared_ptr<const AudioBuffers>);
+	explicit AudioBuffers (boost::shared_ptr<const AudioBuffers>);
 	~AudioBuffers ();
 
 	AudioBuffers & operator= (AudioBuffers const &);
diff --git a/src/lib/audio_content.h b/src/lib/audio_content.h
index e582bca20..a1f5ba8a0 100644
--- a/src/lib/audio_content.h
+++ b/src/lib/audio_content.h
@@ -43,7 +43,7 @@ public:
 class AudioContent : public ContentPart
 {
 public:
-	AudioContent (Content* parent);
+	explicit AudioContent (Content* parent);
 	AudioContent (Content* parent, std::vector<boost::shared_ptr<Content> >);
 
 	void as_xml (xmlpp::Node *) const;
diff --git a/src/lib/audio_delay.h b/src/lib/audio_delay.h
index 644ca1fb4..22be33478 100644
--- a/src/lib/audio_delay.h
+++ b/src/lib/audio_delay.h
@@ -25,7 +25,7 @@ class AudioBuffers;
 class AudioDelay
 {
 public:
-	AudioDelay (int samples);
+	explicit AudioDelay (int samples);
 	boost::shared_ptr<AudioBuffers> run (boost::shared_ptr<const AudioBuffers> in);
 	void flush ();
 
diff --git a/src/lib/audio_filter.h b/src/lib/audio_filter.h
index b6b75cbb0..fb7b7b92c 100644
--- a/src/lib/audio_filter.h
+++ b/src/lib/audio_filter.h
@@ -32,7 +32,7 @@ struct audio_filter_impulse_input_test;
 class AudioFilter
 {
 public:
-	AudioFilter (float transition_bandwidth)
+	explicit AudioFilter (float transition_bandwidth)
 		: _ir (0)
 	{
 		_M = 4 / transition_bandwidth;
diff --git a/src/lib/audio_merger.h b/src/lib/audio_merger.h
index 6c9d87097..dbc0c8691 100644
--- a/src/lib/audio_merger.h
+++ b/src/lib/audio_merger.h
@@ -31,7 +31,7 @@
 class AudioMerger
 {
 public:
-	AudioMerger (int frame_rate);
+	explicit AudioMerger (int frame_rate);
 
 	std::list<std::pair<boost::shared_ptr<AudioBuffers>, DCPTime> > pull (DCPTime time);
 	void push (boost::shared_ptr<const AudioBuffers> audio, DCPTime time);
diff --git a/src/lib/audio_point.h b/src/lib/audio_point.h
index cc5e4943d..91f0cb0e9 100644
--- a/src/lib/audio_point.h
+++ b/src/lib/audio_point.h
@@ -37,7 +37,7 @@ public:
 	};
 
 	AudioPoint ();
-	AudioPoint (cxml::ConstNodePtr node);
+	explicit AudioPoint (cxml::ConstNodePtr node);
 	AudioPoint (AudioPoint const &);
 	AudioPoint& operator= (AudioPoint const &);
 
diff --git a/src/lib/cinema.h b/src/lib/cinema.h
index 3cb17502b..6a3d89845 100644
--- a/src/lib/cinema.h
+++ b/src/lib/cinema.h
@@ -48,7 +48,7 @@ public:
 		, _utc_offset_minute (utc_offset_minute)
 	{}
 
-	Cinema (cxml::ConstNodePtr);
+	explicit Cinema (cxml::ConstNodePtr);
 
 	void read_screens (cxml::ConstNodePtr);
 
diff --git a/src/lib/colour_conversion.h b/src/lib/colour_conversion.h
index 90405f282..73b6ad23c 100644
--- a/src/lib/colour_conversion.h
+++ b/src/lib/colour_conversion.h
@@ -37,7 +37,7 @@ class ColourConversion : public dcp::ColourConversion
 {
 public:
 	ColourConversion ();
-	ColourConversion (dcp::ColourConversion);
+	explicit ColourConversion (dcp::ColourConversion);
 	ColourConversion (cxml::NodePtr, int version);
 	virtual ~ColourConversion () {}
 
diff --git a/src/lib/content.h b/src/lib/content.h
index 836a3bd77..ea764907a 100644
--- a/src/lib/content.h
+++ b/src/lib/content.h
@@ -63,7 +63,7 @@ public:
 class Content : public boost::enable_shared_from_this<Content>, public Signaller, public boost::noncopyable
 {
 public:
-	Content (boost::shared_ptr<const Film>);
+	explicit Content (boost::shared_ptr<const Film>);
 	Content (boost::shared_ptr<const Film>, DCPTime);
 	Content (boost::shared_ptr<const Film>, boost::filesystem::path);
 	Content (boost::shared_ptr<const Film>, cxml::ConstNodePtr);
diff --git a/src/lib/content_part.h b/src/lib/content_part.h
index d3b9b310d..4f6e9e396 100644
--- a/src/lib/content_part.h
+++ b/src/lib/content_part.h
@@ -1,3 +1,4 @@
+
 /*
     Copyright (C) 2016 Carl Hetherington <cth@carlh.net>
 
@@ -31,7 +32,7 @@ class Film;
 class ContentPart
 {
 public:
-	ContentPart (Content* parent)
+	explicit ContentPart (Content* parent)
 		: _parent (parent)
 	{}
 
diff --git a/src/lib/content_subtitle.h b/src/lib/content_subtitle.h
index 8751d56cb..f834fe197 100644
--- a/src/lib/content_subtitle.h
+++ b/src/lib/content_subtitle.h
@@ -32,7 +32,7 @@ class Image;
 class ContentSubtitle
 {
 public:
-	ContentSubtitle (ContentTime f)
+	explicit ContentSubtitle (ContentTime f)
 		: _from (f)
 	{}
 
diff --git a/src/lib/dcp.h b/src/lib/dcp.h
index e2e83e96e..575bcc803 100644
--- a/src/lib/dcp.h
+++ b/src/lib/dcp.h
@@ -33,7 +33,7 @@ public:
 	std::list<boost::shared_ptr<dcp::CPL> > cpls () const;
 
 protected:
-	DCP (boost::shared_ptr<const DCPContent> content)
+	explicit DCP (boost::shared_ptr<const DCPContent> content)
 		: _dcp_content (content)
 	{}
 
diff --git a/src/lib/dcp_examiner.h b/src/lib/dcp_examiner.h
index d9c372c3c..aaeec6d32 100644
--- a/src/lib/dcp_examiner.h
+++ b/src/lib/dcp_examiner.h
@@ -31,7 +31,7 @@ class DCPContent;
 class DCPExaminer : public DCP, public VideoExaminer, public AudioExaminer
 {
 public:
-	DCPExaminer (boost::shared_ptr<const DCPContent>);
+	explicit DCPExaminer (boost::shared_ptr<const DCPContent>);
 
 	boost::optional<double> video_frame_rate () const {
 		return _video_frame_rate;
diff --git a/src/lib/dcpomatic_socket.h b/src/lib/dcpomatic_socket.h
index fa5250a1a..6f7c05e22 100644
--- a/src/lib/dcpomatic_socket.h
+++ b/src/lib/dcpomatic_socket.h
@@ -30,7 +30,7 @@
 class Socket : public boost::noncopyable
 {
 public:
-	Socket (int timeout = 30);
+	explicit Socket (int timeout = 30);
 
 	/** @return Our underlying socket */
 	boost::asio::ip::tcp::socket& socket () {
diff --git a/src/lib/dkdm_wrapper.h b/src/lib/dkdm_wrapper.h
index 0c8b5fbfd..09e9d25c4 100644
--- a/src/lib/dkdm_wrapper.h
+++ b/src/lib/dkdm_wrapper.h
@@ -52,7 +52,7 @@ private:
 class DKDM : public DKDMBase
 {
 public:
-	DKDM (dcp::EncryptedKDM k)
+	explicit DKDM (dcp::EncryptedKDM k)
 		: _dkdm (k)
 	{}
 
@@ -70,7 +70,7 @@ private:
 class DKDMGroup : public DKDMBase
 {
 public:
-	DKDMGroup (std::string name)
+	explicit DKDMGroup (std::string name)
 		: _name (name)
 	{}
 
diff --git a/src/lib/event_history.h b/src/lib/event_history.h
index f723591fb..e194f6333 100644
--- a/src/lib/event_history.h
+++ b/src/lib/event_history.h
@@ -27,7 +27,7 @@
 class EventHistory
 {
 public:
-	EventHistory (int size);
+	explicit EventHistory (int size);
 
 	float rate () const;
 	void event ();
diff --git a/src/lib/exceptions.h b/src/lib/exceptions.h
index 08cbcb1d6..5efb045b7 100644
--- a/src/lib/exceptions.h
+++ b/src/lib/exceptions.h
@@ -39,7 +39,7 @@ extern "C" {
 class DecodeError : public std::runtime_error
 {
 public:
-	DecodeError (std::string s)
+	explicit DecodeError (std::string s)
 		: std::runtime_error (s)
 	{}
 };
@@ -50,7 +50,7 @@ public:
 class EncodeError : public std::runtime_error
 {
 public:
-	EncodeError (std::string s)
+	explicit EncodeError (std::string s)
 		: std::runtime_error (s)
 	{}
 };
@@ -84,7 +84,7 @@ private:
 class JoinError : public std::runtime_error
 {
 public:
-	JoinError (std::string s)
+	explicit JoinError (std::string s)
 		: std::runtime_error (s)
 	{}
 };
@@ -158,7 +158,7 @@ class MissingSettingError : public SettingError
 {
 public:
 	/** @param s Name of setting that was required */
-	MissingSettingError (std::string s);
+	explicit MissingSettingError (std::string s);
 };
 
 /** @class BadSettingError
@@ -181,7 +181,7 @@ public:
 class NetworkError : public std::runtime_error
 {
 public:
-	NetworkError (std::string s)
+	explicit NetworkError (std::string s)
 		: std::runtime_error (s)
 	{}
 };
@@ -192,7 +192,7 @@ public:
 class KDMError : public std::runtime_error
 {
 public:
-	KDMError (std::string s)
+	explicit KDMError (std::string s)
 		: std::runtime_error (s)
 	{}
 };
@@ -218,7 +218,7 @@ public:
 class DCPError : public std::runtime_error
 {
 public:
-	DCPError (std::string s)
+	explicit DCPError (std::string s)
 		: std::runtime_error (s)
 	{}
 };
@@ -227,7 +227,7 @@ class InvalidSignerError : public std::runtime_error
 {
 public:
 	InvalidSignerError ();
-	InvalidSignerError (std::string reason);
+	explicit InvalidSignerError (std::string reason);
 };
 
 class ProgrammingError : public std::runtime_error
@@ -239,7 +239,7 @@ public:
 class TextEncodingError : public std::runtime_error
 {
 public:
-	TextEncodingError (std::string s)
+	explicit TextEncodingError (std::string s)
 		: std::runtime_error (s)
 	{}
 };
@@ -247,7 +247,7 @@ public:
 class OldFormatError : public std::runtime_error
 {
 public:
-	OldFormatError (std::string s)
+	explicit OldFormatError (std::string s)
 		: std::runtime_error (s)
 	{}
 };
diff --git a/src/lib/ffmpeg.h b/src/lib/ffmpeg.h
index 95a8bf5d9..dab67ead9 100644
--- a/src/lib/ffmpeg.h
+++ b/src/lib/ffmpeg.h
@@ -40,7 +40,7 @@ class Log;
 class FFmpeg
 {
 public:
-	FFmpeg (boost::shared_ptr<const FFmpegContent>);
+	explicit FFmpeg (boost::shared_ptr<const FFmpegContent>);
 	virtual ~FFmpeg ();
 
 	boost::shared_ptr<const FFmpegContent> ffmpeg_content () const {
diff --git a/src/lib/ffmpeg_stream.h b/src/lib/ffmpeg_stream.h
index ec27a30f0..84b2a8853 100644
--- a/src/lib/ffmpeg_stream.h
+++ b/src/lib/ffmpeg_stream.h
@@ -35,7 +35,7 @@ public:
 		, _id (i)
 	{}
 
-	FFmpegStream (cxml::ConstNodePtr);
+	explicit FFmpegStream (cxml::ConstNodePtr);
 
 	void as_xml (xmlpp::Node *) const;
 
diff --git a/src/lib/ffmpeg_subtitle_period.h b/src/lib/ffmpeg_subtitle_period.h
index 1c2c05975..42c7bf763 100644
--- a/src/lib/ffmpeg_subtitle_period.h
+++ b/src/lib/ffmpeg_subtitle_period.h
@@ -24,7 +24,7 @@
 class FFmpegSubtitlePeriod
 {
 public:
-	FFmpegSubtitlePeriod (ContentTime f)
+	explicit FFmpegSubtitlePeriod (ContentTime f)
 		: from (f)
 	{}
 
diff --git a/src/lib/file_group.h b/src/lib/file_group.h
index 865e6bd22..800d9a059 100644
--- a/src/lib/file_group.h
+++ b/src/lib/file_group.h
@@ -35,8 +35,8 @@ class FileGroup
 {
 public:
 	FileGroup ();
-	FileGroup (boost::filesystem::path);
-	FileGroup (std::vector<boost::filesystem::path> const &);
+	explicit FileGroup (boost::filesystem::path);
+	explicit FileGroup (std::vector<boost::filesystem::path> const &);
 	~FileGroup ();
 
 	void set_paths (std::vector<boost::filesystem::path> const &);
diff --git a/src/lib/file_log.h b/src/lib/file_log.h
index bd6a7bf6a..6904bfd77 100644
--- a/src/lib/file_log.h
+++ b/src/lib/file_log.h
@@ -23,7 +23,7 @@
 class FileLog : public Log
 {
 public:
-	FileLog (boost::filesystem::path file);
+	explicit FileLog (boost::filesystem::path file);
 
 	std::string head_and_tail (int amount = 1024) const;
 
diff --git a/src/lib/film.h b/src/lib/film.h
index 355a41da5..20a1e2ca6 100644
--- a/src/lib/film.h
+++ b/src/lib/film.h
@@ -67,7 +67,7 @@ struct isdcf_name_test;
 class Film : public boost::enable_shared_from_this<Film>, public Signaller, public boost::noncopyable
 {
 public:
-	Film (boost::optional<boost::filesystem::path> dir);
+	explicit Film (boost::optional<boost::filesystem::path> dir);
 	~Film ();
 
 	boost::filesystem::path info_file (DCPTimePeriod p) const;
diff --git a/src/lib/font.h b/src/lib/font.h
index bbf88b34a..cb18e4798 100644
--- a/src/lib/font.h
+++ b/src/lib/font.h
@@ -31,10 +31,10 @@
 class Font
 {
 public:
-	Font (std::string id)
+	explicit Font (std::string id)
 		: _id (id) {}
 
-	Font (cxml::NodePtr node);
+	explicit Font (cxml::NodePtr node);
 
 	void as_xml (xmlpp::Node* node);
 
diff --git a/src/lib/image.h b/src/lib/image.h
index 8de0a2c69..f71a47b0c 100644
--- a/src/lib/image.h
+++ b/src/lib/image.h
@@ -41,8 +41,8 @@ class Image
 {
 public:
 	Image (AVPixelFormat p, dcp::Size s, bool aligned, int extra_pixels = 0);
-	Image (AVFrame *);
-	Image (Image const &);
+	explicit Image (AVFrame *);
+	explicit Image (Image const &);
 	Image (boost::shared_ptr<const Image>, bool);
 	Image& operator= (Image const &);
 	~Image ();
diff --git a/src/lib/isdcf_metadata.h b/src/lib/isdcf_metadata.h
index 5d0e865fb..49d204cf4 100644
--- a/src/lib/isdcf_metadata.h
+++ b/src/lib/isdcf_metadata.h
@@ -39,7 +39,7 @@ public:
 		, two_d_version_of_three_d (false)
 	{}
 
-	ISDCFMetadata (cxml::ConstNodePtr);
+	explicit ISDCFMetadata (cxml::ConstNodePtr);
 
 	void as_xml (xmlpp::Node *) const;
 	void read_old_metadata (std::string, std::string);
diff --git a/src/lib/job.h b/src/lib/job.h
index 185273e2d..e5552e49e 100644
--- a/src/lib/job.h
+++ b/src/lib/job.h
@@ -40,7 +40,7 @@ class Film;
 class Job : public boost::enable_shared_from_this<Job>, public Signaller, public boost::noncopyable
 {
 public:
-	Job (boost::shared_ptr<const Film> film);
+	explicit Job (boost::shared_ptr<const Film> film);
 	virtual ~Job ();
 
 	/** @return user-readable name of this job */
diff --git a/src/lib/json_server.h b/src/lib/json_server.h
index 996b9bf79..f36e621f3 100644
--- a/src/lib/json_server.h
+++ b/src/lib/json_server.h
@@ -23,7 +23,7 @@
 class JSONServer
 {
 public:
-	JSONServer (int port);
+	explicit JSONServer (int port);
 
 private:
 	void run (int port);
diff --git a/src/lib/log_entry.h b/src/lib/log_entry.h
index ba358f5a3..3d6a9f371 100644
--- a/src/lib/log_entry.h
+++ b/src/lib/log_entry.h
@@ -36,7 +36,7 @@ public:
 	static const int TYPE_TIMING;
 	static const int TYPE_DEBUG_EMAIL;
 
-	LogEntry (int type);
+	explicit LogEntry (int type);
 	virtual ~LogEntry () {}
 
 	virtual std::string message () const = 0;
diff --git a/src/lib/magick_image_proxy.h b/src/lib/magick_image_proxy.h
index 1db45d73b..32d2f7efb 100644
--- a/src/lib/magick_image_proxy.h
+++ b/src/lib/magick_image_proxy.h
@@ -26,7 +26,7 @@
 class MagickImageProxy : public ImageProxy
 {
 public:
-	MagickImageProxy (boost::filesystem::path);
+	explicit MagickImageProxy (boost::filesystem::path);
 	MagickImageProxy (boost::shared_ptr<cxml::Node> xml, boost::shared_ptr<Socket> socket);
 
 	boost::shared_ptr<Image> image (
diff --git a/src/lib/raw_image_proxy.h b/src/lib/raw_image_proxy.h
index 2b64cbd9b..9f8424eb3 100644
--- a/src/lib/raw_image_proxy.h
+++ b/src/lib/raw_image_proxy.h
@@ -26,7 +26,7 @@
 class RawImageProxy : public ImageProxy
 {
 public:
-	RawImageProxy (boost::shared_ptr<Image>);
+	explicit RawImageProxy (boost::shared_ptr<Image>);
 	RawImageProxy (boost::shared_ptr<cxml::Node> xml, boost::shared_ptr<Socket> socket);
 
 	boost::shared_ptr<Image> image (
diff --git a/src/lib/rgba.h b/src/lib/rgba.h
index b6f0cc1f1..c9521f311 100644
--- a/src/lib/rgba.h
+++ b/src/lib/rgba.h
@@ -45,7 +45,7 @@ public:
 		, a (a_)
 	{}
 
-	RGBA (cxml::ConstNodePtr node);
+	explicit RGBA (cxml::ConstNodePtr node);
 
 	void as_xml (xmlpp::Node* parent) const;
 
diff --git a/src/lib/screen.h b/src/lib/screen.h
index cea5fe29c..5e8f1f975 100644
--- a/src/lib/screen.h
+++ b/src/lib/screen.h
@@ -40,7 +40,7 @@ public:
 		, trusted_devices (td)
 	{}
 
-	Screen (cxml::ConstNodePtr);
+	explicit Screen (cxml::ConstNodePtr);
 
 	void as_xml (xmlpp::Element *) const;
 
diff --git a/src/lib/signaller.h b/src/lib/signaller.h
index a6c74c954..b67a63917 100644
--- a/src/lib/signaller.h
+++ b/src/lib/signaller.h
@@ -71,7 +71,7 @@ template <class T>
 class Wrapper : public WrapperBase
 {
 public:
-	Wrapper (T signal)
+	explicit Wrapper (T signal)
 		: _signal (signal)
 	{
 
diff --git a/src/lib/subtitle_content.h b/src/lib/subtitle_content.h
index 58dc51510..b64e4787b 100644
--- a/src/lib/subtitle_content.h
+++ b/src/lib/subtitle_content.h
@@ -57,7 +57,7 @@ public:
 class SubtitleContent : public ContentPart
 {
 public:
-	SubtitleContent (Content* parent);
+	explicit SubtitleContent (Content* parent);
 	SubtitleContent (Content* parent, std::vector<boost::shared_ptr<Content> >);
 
 	void as_xml (xmlpp::Node *) const;
diff --git a/src/lib/subtitle_string.h b/src/lib/subtitle_string.h
index c1b0b14a8..81ebc2744 100644
--- a/src/lib/subtitle_string.h
+++ b/src/lib/subtitle_string.h
@@ -30,7 +30,7 @@
 class SubtitleString : public dcp::SubtitleString
 {
 public:
-	SubtitleString (dcp::SubtitleString dcp_)
+	explicit SubtitleString (dcp::SubtitleString dcp_)
 		: dcp::SubtitleString (dcp_)
 		, outline_width (2)
 	{}
diff --git a/src/lib/text_subtitle.h b/src/lib/text_subtitle.h
index 94adb5cc5..c72486ca0 100644
--- a/src/lib/text_subtitle.h
+++ b/src/lib/text_subtitle.h
@@ -35,7 +35,7 @@ class text_subtitle_parse_test;
 class TextSubtitle
 {
 public:
-	TextSubtitle (boost::shared_ptr<const TextSubtitleContent>);
+	explicit TextSubtitle (boost::shared_ptr<const TextSubtitleContent>);
 
 	boost::optional<ContentTime> first () const;
 	ContentTime length () const;
diff --git a/src/lib/timer.h b/src/lib/timer.h
index a7d4c8d01..9ea95c720 100644
--- a/src/lib/timer.h
+++ b/src/lib/timer.h
@@ -37,7 +37,7 @@
 class PeriodTimer
 {
 public:
-	PeriodTimer (std::string n);
+	explicit PeriodTimer (std::string n);
 	~PeriodTimer ();
 
 private:
diff --git a/src/lib/transcode_job.h b/src/lib/transcode_job.h
index 47611525a..9dd9e3684 100644
--- a/src/lib/transcode_job.h
+++ b/src/lib/transcode_job.h
@@ -33,7 +33,7 @@ class Encoder;
 class TranscodeJob : public Job
 {
 public:
-	TranscodeJob (boost::shared_ptr<const Film> film);
+	explicit TranscodeJob (boost::shared_ptr<const Film> film);
 
 	std::string name () const;
 	std::string json_name () const;
diff --git a/src/lib/types.h b/src/lib/types.h
index 8f99b8881..ed3746f45 100644
--- a/src/lib/types.h
+++ b/src/lib/types.h
@@ -134,7 +134,7 @@ struct Crop
 {
 	Crop () : left (0), right (0), top (0), bottom (0) {}
 	Crop (int l, int r, int t, int b) : left (l), right (r), top (t), bottom (b) {}
-	Crop (boost::shared_ptr<cxml::Node>);
+	explicit Crop (boost::shared_ptr<cxml::Node>);
 
 	/** Number of pixels to remove from the left-hand side */
 	int left;
diff --git a/src/lib/upload_job.h b/src/lib/upload_job.h
index 4d3768515..407094ab8 100644
--- a/src/lib/upload_job.h
+++ b/src/lib/upload_job.h
@@ -27,7 +27,7 @@
 class UploadJob : public Job
 {
 public:
-	UploadJob (boost::shared_ptr<const Film>);
+	explicit UploadJob (boost::shared_ptr<const Film>);
 
 	std::string name () const;
 	std::string json_name () const;
diff --git a/src/lib/upmixer_a.h b/src/lib/upmixer_a.h
index de02a8d95..fe6a373ca 100644
--- a/src/lib/upmixer_a.h
+++ b/src/lib/upmixer_a.h
@@ -31,7 +31,7 @@
 class UpmixerA : public AudioProcessor
 {
 public:
-	UpmixerA (int sampling_rate);
+	explicit UpmixerA (int sampling_rate);
 
 	std::string name () const;
 	std::string id () const;
diff --git a/src/lib/upmixer_b.h b/src/lib/upmixer_b.h
index 0c724b36c..47b4fadef 100644
--- a/src/lib/upmixer_b.h
+++ b/src/lib/upmixer_b.h
@@ -29,7 +29,7 @@
 class UpmixerB : public AudioProcessor
 {
 public:
-	UpmixerB (int sampling_rate);
+	explicit UpmixerB (int sampling_rate);
 
 	std::string name () const;
 	std::string id () const;
diff --git a/src/lib/video_content.h b/src/lib/video_content.h
index 84b3d2268..774210c13 100644
--- a/src/lib/video_content.h
+++ b/src/lib/video_content.h
@@ -51,7 +51,7 @@ public:
 class VideoContent : public ContentPart, public boost::enable_shared_from_this<VideoContent>
 {
 public:
-	VideoContent (Content* parent);
+	explicit VideoContent (Content* parent);
 	VideoContent (Content* parent, std::vector<boost::shared_ptr<Content> >);
 
 	void as_xml (xmlpp::Node *) const;
diff --git a/src/lib/video_content_scale.h b/src/lib/video_content_scale.h
index 1054234bc..2f161b1a7 100644
--- a/src/lib/video_content_scale.h
+++ b/src/lib/video_content_scale.h
@@ -40,9 +40,9 @@ class VideoContentScale
 {
 public:
 	VideoContentScale ();
-	VideoContentScale (Ratio const *);
-	VideoContentScale (bool);
-	VideoContentScale (boost::shared_ptr<cxml::Node>);
+	explicit VideoContentScale (Ratio const *);
+	explicit VideoContentScale (bool);
+	explicit VideoContentScale (boost::shared_ptr<cxml::Node>);
 
 	dcp::Size size (boost::shared_ptr<const VideoContent>, dcp::Size display_container, dcp::Size film_container) const;
 	std::string id () const;
diff --git a/src/lib/video_mxf_examiner.h b/src/lib/video_mxf_examiner.h
index 43e82da4d..3a0189a2f 100644
--- a/src/lib/video_mxf_examiner.h
+++ b/src/lib/video_mxf_examiner.h
@@ -29,7 +29,7 @@ namespace dcp {
 class VideoMXFExaminer : public VideoExaminer
 {
 public:
-	VideoMXFExaminer (boost::shared_ptr<const VideoMXFContent>);
+	explicit VideoMXFExaminer (boost::shared_ptr<const VideoMXFContent>);
 
 	boost::optional<double> video_frame_rate () const;
 	dcp::Size video_size () const;