💚 Packport std::clamp for pre GCC 7.1

Source/automap.cpp

@@ -257,11 +257,11 @@ void SearchAutomapItem(const CelOutputBuffer &out)
 			y++;
 	}
 
-	const int startX = std::clamp(x - 8, 0, MAXDUNX);
-	const int startY = std::clamp(y - 8, 0, MAXDUNY);
+	const int startX = clamp(x - 8, 0, MAXDUNX);
+	const int startY = clamp(y - 8, 0, MAXDUNY);
 
-	const int endX = std::clamp(x + 8, 0, MAXDUNX);
-	const int endY = std::clamp(y + 8, 0, MAXDUNY);
+	const int endX = clamp(x + 8, 0, MAXDUNX);
+	const int endY = clamp(y + 8, 0, MAXDUNY);
 
 	for (int i = startX; i < endX; i++) {
 		for (int j = startY; j < endY; j++) {

Source/engine.h

@@ -27,6 +27,16 @@
 
 namespace devilution {
 
+#if defined(__clang__) || !defined(__GNUC__) || __GNUC__ > 7 || (__GNUC__ == 7 && __GNUC_MINOR__ < 0)
+using std::clamp;
+#else
+template <typename T>
+constexpr const T &clamp(const T &x, const T &lower, const T &upper)
+{
+	return std::min(std::max(x, lower), upper);
+}
+#endif
+
 #define MemFreeDbg(p)       \
 	{                       \
 		void *p__p;         \

Source/items.cpp

@@ -668,7 +668,7 @@ void CalcPlrItemVals(int p, bool Loadgfx)
 	plr[p]._pIBonusDamMod = dmod;
 	plr[p]._pIGetHit = ghit;
 
-	lrad = std::clamp(lrad, 2, 15);
+	lrad = clamp(lrad, 2, 15);
 
 	if (plr[p]._pLightRad != lrad && p == myplr) {
 		ChangeLightRadius(plr[p]._plid, lrad);
@@ -752,9 +752,9 @@ void CalcPlrItemVals(int p, bool Loadgfx)
 		lr = 0;
 	}
 
-	plr[p]._pMagResist = std::clamp(mr, 0, MAXRESIST);
-	plr[p]._pFireResist = std::clamp(fr, 0, MAXRESIST);
-	plr[p]._pLghtResist = std::clamp(lr, 0, MAXRESIST);
+	plr[p]._pMagResist = clamp(mr, 0, MAXRESIST);
+	plr[p]._pFireResist = clamp(fr, 0, MAXRESIST);
+	plr[p]._pLghtResist = clamp(lr, 0, MAXRESIST);
 
 	if (plr[p]._pClass == HeroClass::Warrior) {
 		vadd *= 2;
@@ -4383,7 +4383,7 @@ static void SpawnOnePremium(int i, int plvl, int myplr)
 	dexterity *= 1.2;
 	magic *= 1.2;
 
-	plvl = std::clamp(plvl, 1, 30);
+	plvl = clamp(plvl, 1, 30);
 
 	int count = 0;