From: Mikko Rasa <tdb@tdb.fi>
Date: Sun, 31 Oct 2021 13:05:18 +0000 (+0200)
Subject: Mark boolean conversion operators as explicit
X-Git-Url: http://git.tdb.fi/?p=libs%2Fcore.git;a=commitdiff_plain;h=9990be018b49e5aae27218e1b8c6aefdb63b38a7;hp=8e1db641bb244980bc96ee9da4ba2f0dee8274ad

Mark boolean conversion operators as explicit

Also turn const void * operators into actual boolean conversions.
---

diff --git a/source/io/handle.cpp b/source/io/handle.cpp
index 693f93f..53b5a7e 100644
--- a/source/io/handle.cpp
+++ b/source/io/handle.cpp
@@ -25,9 +25,9 @@ Handle::~Handle()
 	delete priv;
 }
 
-Handle::operator const void *() const
+Handle::operator bool() const
 {
-	return priv->handle!=INVALID_HANDLE_VALUE ? this : 0;
+	return priv->handle!=INVALID_HANDLE_VALUE;
 }
 
 
diff --git a/source/io/handle.h b/source/io/handle.h
index 3e06c71..561d710 100644
--- a/source/io/handle.h
+++ b/source/io/handle.h
@@ -23,10 +23,7 @@ public:
 	Private &operator*() { return *priv; }
 	const Private &operator*() const { return *priv; }
 
-	/** This is effectively a boolean conversion, but avoids accidental
-	conversion to OS native handles.  Unix-based systems use int and win32 uses
-	void *; const void * is not implicitly convertible to either. */
-	operator const void *() const;
+	explicit operator bool() const;
 };
 
 
diff --git a/source/stringcodec/jisx0208.h b/source/stringcodec/jisx0208.h
index ee7b687..3941282 100644
--- a/source/stringcodec/jisx0208.h
+++ b/source/stringcodec/jisx0208.h
@@ -43,7 +43,7 @@ struct Kuten
 	unsigned short ku = 0;
 	unsigned short ten = 0;
 
-	operator bool() { return ku!=0 && ten!=0; }
+	explicit operator bool() { return ku!=0 && ten!=0; }
 };
 
 unichar jisx0208_to_ucs(Kuten);
diff --git a/source/strings/regmatch.h b/source/strings/regmatch.h
index 48f65c6..6af309e 100644
--- a/source/strings/regmatch.h
+++ b/source/strings/regmatch.h
@@ -32,7 +32,7 @@ public:
 		size_type length;    //< Length of the match (end-begin)
 		std::string str;     //< The part of the string that matched
 
-		operator bool() const { return match; }
+		explicit operator bool() const { return match; }
 	};
 
 private:
@@ -65,7 +65,7 @@ public:
 	/** Shorthand for the group() function. */
 	const Group &operator[](unsigned i) const { return group(i); }
 
-	operator bool() const { return !empty(); }
+	explicit operator bool() const { return !empty(); }
 };
 
 } // namespace Msp
diff --git a/source/time/timedelta.h b/source/time/timedelta.h
index a3e62f1..1a4274b 100644
--- a/source/time/timedelta.h
+++ b/source/time/timedelta.h
@@ -54,7 +54,7 @@ public:
 	bool operator==(const TimeDelta &t) const { return usec==t.usec; }
 	bool operator!=(const TimeDelta &t) const { return usec!=t.usec; }
 
-	operator const void *() const { return usec ? this : 0; }
+	explicit operator bool() const { return usec; }
 };
 
 template<typename T>
diff --git a/source/time/timestamp.h b/source/time/timestamp.h
index 2a5c4e1..8068510 100644
--- a/source/time/timestamp.h
+++ b/source/time/timestamp.h
@@ -46,7 +46,7 @@ public:
 	bool operator==(const TimeStamp &t) const { return usec==t.usec; }
 	bool operator!=(const TimeStamp &t) const { return usec!=t.usec; }
 
-	operator const void *() const { return usec>0 ? this : 0; }
+	explicit operator bool() const { return usec>0; }
 
 	static TimeStamp from_unixtime(time_t t) { return TimeStamp(t*1000000LL); }
 };