Modernize source code: last part (#6285)

* Modernize source code: last par

* Use empty when needed
* Use emplace_back instead of push_back when needed
* For range-based loops
* Initializers fixes
* constructors, destructors default
* c++ C stl includes

7 files changed, 35 insertions, 37 deletions

diff --git a/src/util/areastore.cpp b/src/util/areastore.cpp
index c660502f6..50d237bba 100644
--- a/src/util/areastore.cpp
+++ b/src/util/areastore.cpp
@@ -68,9 +68,8 @@ void AreaStore::serialize(std::ostream &os) const
 
 	// TODO: Compression?
 	writeU16(os, areas_map.size());
-	for (AreaMap::const_iterator it = areas_map.begin();
-			it != areas_map.end(); ++it) {
-		const Area &a = it->second;
+	for (const auto &it : areas_map) {
+		const Area &a = it.second;
 		writeV3S16(os, a.minedge);
 		writeV3S16(os, a.maxedge);
 		writeU16(os, a.data.size());
@@ -193,10 +192,9 @@ bool VectorAreaStore::removeArea(u32 id)
 
 void VectorAreaStore::getAreasForPosImpl(std::vector<Area *> *result, v3s16 pos)
 {
-	for (size_t i = 0; i < m_areas.size(); ++i) {
-		Area *b = m_areas[i];
-		if (AST_CONTAINS_PT(b, pos)) {
-			result->push_back(b);
+	for (Area *area : m_areas) {
+		if (AST_CONTAINS_PT(area, pos)) {
+			result->push_back(area);
 		}
 	}
 }
@@ -204,11 +202,10 @@ void VectorAreaStore::getAreasForPosImpl(std::vector<Area *> *result, v3s16 pos)
 void VectorAreaStore::getAreasInArea(std::vector<Area *> *result,
 		v3s16 minedge, v3s16 maxedge, bool accept_overlap)
 {
-	for (size_t i = 0; i < m_areas.size(); ++i) {
-		Area *b = m_areas[i];
-		if (accept_overlap ? AST_AREAS_OVERLAP(minedge, maxedge, b) :
-				AST_CONTAINS_AREA(minedge, maxedge, b)) {
-			result->push_back(b);
+	for (Area *area : m_areas) {
+		if (accept_overlap ? AST_AREAS_OVERLAP(minedge, maxedge, area) :
+				AST_CONTAINS_AREA(minedge, maxedge, area)) {
+			result->push_back(area);
 		}
 	}
 }
diff --git a/src/util/areastore.h b/src/util/areastore.h
index e94aa4e2a..24840210e 100644
--- a/src/util/areastore.h
+++ b/src/util/areastore.h
@@ -37,7 +37,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 
 struct Area {
-	Area() {}
+	Area() = default;
+
 	Area(const v3s16 &mine, const v3s16 &maxe) :
 		minedge(mine), maxedge(maxe)
 	{
@@ -56,7 +57,7 @@ public:
 		m_res_cache(1000, &cacheMiss, this)
 	{}
 
-	virtual ~AreaStore() {}
+	virtual ~AreaStore() = default;
 
 	static AreaStore *getOptimalImplementation();
 
diff --git a/src/util/enriched_string.cpp b/src/util/enriched_string.cpp
index 05d7b8c25..f79e77d5a 100644
--- a/src/util/enriched_string.cpp
+++ b/src/util/enriched_string.cpp
@@ -97,7 +97,6 @@ void EnrichedString::addAtEnd(const std::wstring &s, const SColor &initial_color
 			parseColorString(wide_to_utf8(parts[1]), m_background, true);
 			m_has_background = true;
 		}
-		continue;
 	}
 }
 
@@ -111,7 +110,7 @@ void EnrichedString::addCharNoColor(wchar_t c)
 {
 	m_string += c;
 	if (m_colors.empty()) {
-		m_colors.push_back(SColor(255, 255, 255, 255));
+		m_colors.emplace_back(255, 255, 255, 255);
 	} else {
 		m_colors.push_back(m_colors[m_colors.size() - 1]);
 	}
@@ -138,15 +137,16 @@ EnrichedString EnrichedString::substr(size_t pos, size_t len) const
 	}
 	if (len == std::string::npos || pos + len > m_string.length()) {
 		return EnrichedString(
-		           m_string.substr(pos, std::string::npos),
-		           std::vector<SColor>(m_colors.begin() + pos, m_colors.end())
-		       );
-	} else {
-		return EnrichedString(
-		           m_string.substr(pos, len),
-		           std::vector<SColor>(m_colors.begin() + pos, m_colors.begin() + pos + len)
-		       );
+			m_string.substr(pos, std::string::npos),
+			std::vector<SColor>(m_colors.begin() + pos, m_colors.end())
+		);
 	}
+
+	return EnrichedString(
+		m_string.substr(pos, len),
+		std::vector<SColor>(m_colors.begin() + pos, m_colors.begin() + pos + len)
+	);
+
 }
 
 const wchar_t *EnrichedString::c_str() const
diff --git a/src/util/numeric.h b/src/util/numeric.h
index 36e6fddd0..766efd366 100644
--- a/src/util/numeric.h
+++ b/src/util/numeric.h
@@ -281,7 +281,8 @@ inline aabb3f getNodeBox(v3s16 p, float d)
 class IntervalLimiter
 {
 public:
-	IntervalLimiter() {}
+	IntervalLimiter() = default;
+
 	/*
 		dtime: time from last call to this method
 		wanted_interval: interval wanted
diff --git a/src/util/srp.cpp b/src/util/srp.cpp
index aa8dcb4a7..4c1a772e2 100644
--- a/src/util/srp.cpp
+++ b/src/util/srp.cpp
@@ -697,7 +697,7 @@ struct SRPVerifier *srp_verifier_new(SRP_HashAlgorithm alg,
 		goto cleanup_and_exit;
 	}
 
-	memcpy((char *)ver->username, username, ulen);
+	memcpy(ver->username, username, ulen);
 
 	ver->authenticated = 0;
 
diff --git a/src/util/string.cpp b/src/util/string.cpp
index d41b91f24..fc2a2057f 100644
--- a/src/util/string.cpp
+++ b/src/util/string.cpp
@@ -167,7 +167,7 @@ std::string wide_to_utf8(const std::wstring &input)
 
 wchar_t *utf8_to_wide_c(const char *str)
 {
-	std::wstring ret = utf8_to_wide(std::string(str)).c_str();
+	std::wstring ret = utf8_to_wide(std::string(str));
 	size_t len = ret.length();
 	wchar_t *ret_c = new wchar_t[len + 1];
 	memset(ret_c, 0, (len + 1) * sizeof(wchar_t));
@@ -308,8 +308,8 @@ std::string wide_to_narrow(const std::wstring &wcs)
 	size_t len = wcstombs(*mbs, wcs.c_str(), mbl);
 	if (len == (size_t)(-1))
 		return "Character conversion failed!";
-	else
-		mbs[len] = 0;
+
+	mbs[len] = 0;
 	return *mbs;
 }
 
@@ -321,8 +321,7 @@ std::string urlencode(const std::string &str)
 	// followed by two hex digits. See RFC 3986, section 2.3.
 	static const char url_hex_chars[] = "0123456789ABCDEF";
 	std::ostringstream oss(std::ios::binary);
-	for (u32 i = 0; i < str.size(); i++) {
-		unsigned char c = str[i];
+	for (unsigned char c : str) {
 		if (isalnum(c) || c == '-' || c == '.' || c == '_' || c == '~') {
 			oss << c;
 		} else {
diff --git a/src/util/string.h b/src/util/string.h
index 584ffb73a..122262af8 100644
--- a/src/util/string.h
+++ b/src/util/string.h
@@ -20,7 +20,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #pragma once
 
 #include "irrlichttypes_bloated.h"
-#include <stdlib.h>
+#include <cstdlib>
 #include <string>
 #include <cstring>
 #include <vector>
@@ -231,12 +231,12 @@ inline std::vector<std::basic_string<T> > str_split(
  */
 inline std::string lowercase(const std::string &str)
 {
-	std::string s2 = "";
+	std::string s2;
 
 	s2.reserve(str.size());
 
-	for (size_t i = 0; i < str.size(); i++)
-		s2 += tolower(str[i]);
+	for (char i : str)
+		s2 += tolower(i);
 
 	return s2;
 }
@@ -607,8 +607,8 @@ std::vector<std::basic_string<T> > split(const std::basic_string<T> &s, T delim)
  */
 inline bool is_number(const std::string &to_check)
 {
-	for (size_t i = 0; i < to_check.size(); i++)
-		if (!std::isdigit(to_check[i]))
+	for (char i : to_check)
+		if (!std::isdigit(i))
 			return false;
 
 	return !to_check.empty();