fs/io/*: make constructors "explicit"

src/fs/io/AutoGunzipReader.hxx

@@ -36,7 +36,7 @@ class AutoGunzipReader final : public Reader {
 	GunzipReader *gunzip = nullptr;
 
 public:
-	AutoGunzipReader(Reader &_next)
+	explicit AutoGunzipReader(Reader &_next)
 		:peek(_next) {}
 	~AutoGunzipReader();
 

src/fs/io/BufferedOutputStream.hxx

@@ -44,7 +44,7 @@ class BufferedOutputStream {
 	DynamicFifoBuffer<char> buffer;
 
 public:
-	BufferedOutputStream(OutputStream &_os)
+	explicit BufferedOutputStream(OutputStream &_os)
 		:os(_os), buffer(32768) {}
 
 	void Write(const void *data, size_t size);

src/fs/io/BufferedReader.hxx

@@ -40,7 +40,7 @@ class BufferedReader {
 	unsigned line_number = 0;
 
 public:
-	BufferedReader(Reader &_reader)
+	explicit BufferedReader(Reader &_reader)
 		:reader(_reader), buffer(4096) {}
 
 	/**

src/fs/io/FileOutputStream.hxx

@@ -88,7 +88,7 @@ private:
 	Mode mode;
 
 public:
-	FileOutputStream(Path _path, Mode _mode=Mode::CREATE);
+	explicit FileOutputStream(Path _path, Mode _mode=Mode::CREATE);
 
 	~FileOutputStream() {
 		if (IsDefined())

src/fs/io/FileReader.hxx

@@ -46,7 +46,7 @@ class FileReader final : public Reader {
 #endif
 
 public:
-	FileReader(Path _path);
+	explicit FileReader(Path _path);
 
 #ifdef WIN32
 	FileReader(FileReader &&other)

src/fs/io/GunzipReader.hxx

@@ -43,7 +43,7 @@ public:
 	/**
 	 * Construct the filter.
 	 */
-	GunzipReader(Reader &_next);
+	explicit GunzipReader(Reader &_next);
 
 	~GunzipReader() {
 		inflateEnd(&z);

src/fs/io/GzipOutputStream.hxx

@@ -41,7 +41,7 @@ public:
 	/**
 	 * Construct the filter.
 	 */
-	GzipOutputStream(OutputStream &_next);
+	explicit GzipOutputStream(OutputStream &_next);
 	~GzipOutputStream();
 
 	/**

src/fs/io/PeekReader.hxx

@@ -39,7 +39,7 @@ class PeekReader final : public Reader {
 	uint8_t buffer[64];
 
 public:
-	PeekReader(Reader &_next)
+	explicit PeekReader(Reader &_next)
 		:next(_next) {}
 
 	const void *Peek(size_t size);

src/fs/io/StdioOutputStream.hxx

@@ -30,7 +30,7 @@ class StdioOutputStream final : public OutputStream {
 	FILE *const file;
 
 public:
-	StdioOutputStream(FILE *_file):file(_file) {}
+	explicit StdioOutputStream(FILE *_file):file(_file) {}
 
 	/* virtual methods from class OutputStream */
 	void Write(const void *data, size_t size) override {

src/fs/io/TextFile.hxx

@@ -38,7 +38,7 @@ class TextFile {
 	BufferedReader *const buffered_reader;
 
 public:
-	TextFile(Path path_fs);
+	explicit TextFile(Path path_fs);
 
 	TextFile(const TextFile &other) = delete;