From 63d4ee1968144cc3d115f92baef95785abf813ac Mon Sep 17 00:00:00 2001
From: Sebastian Falbesoner <sebastian.falbesoner@gmail.com>
Date: Fri, 20 Nov 2020 01:01:35 +0100
Subject: refactor: iterate arrays via C++11 range-based for loops if idx is
 not needed

---
 src/qt/networkstyle.cpp  | 13 +++++--------
 src/qt/platformstyle.cpp | 15 ++++++---------
 src/rest.cpp             | 20 +++++++++++---------
 src/test/miner_tests.cpp |  7 +++----
 4 files changed, 25 insertions(+), 30 deletions(-)

diff --git a/src/qt/networkstyle.cpp b/src/qt/networkstyle.cpp
index b1081f6aee..ee70c1bc30 100644
--- a/src/qt/networkstyle.cpp
+++ b/src/qt/networkstyle.cpp
@@ -22,7 +22,6 @@ static const struct {
     {"signet", QAPP_APP_NAME_SIGNET, 35, 15},
     {"regtest", QAPP_APP_NAME_REGTEST, 160, 30},
 };
-static const unsigned network_styles_count = sizeof(network_styles)/sizeof(*network_styles);
 
 // titleAddText needs to be const char* for tr()
 NetworkStyle::NetworkStyle(const QString &_appName, const int iconColorHueShift, const int iconColorSaturationReduction, const char *_titleAddText):
@@ -81,14 +80,12 @@ NetworkStyle::NetworkStyle(const QString &_appName, const int iconColorHueShift,
 const NetworkStyle* NetworkStyle::instantiate(const std::string& networkId)
 {
     std::string titleAddText = networkId == CBaseChainParams::MAIN ? "" : strprintf("[%s]", networkId);
-    for (unsigned x=0; x<network_styles_count; ++x)
-    {
-        if (networkId == network_styles[x].networkId)
-        {
+    for (const auto& network_style : network_styles) {
+        if (networkId == network_style.networkId) {
             return new NetworkStyle(
-                    network_styles[x].appName,
-                    network_styles[x].iconColorHueShift,
-                    network_styles[x].iconColorSaturationReduction,
+                    network_style.appName,
+                    network_style.iconColorHueShift,
+                    network_style.iconColorSaturationReduction,
                     titleAddText.c_str());
         }
     }
diff --git a/src/qt/platformstyle.cpp b/src/qt/platformstyle.cpp
index c6b80fd340..aab8d8e4af 100644
--- a/src/qt/platformstyle.cpp
+++ b/src/qt/platformstyle.cpp
@@ -23,7 +23,6 @@ static const struct {
     /* Other: linux, unix, ... */
     {"other", true, true, false}
 };
-static const unsigned platform_styles_count = sizeof(platform_styles)/sizeof(*platform_styles);
 
 namespace {
 /* Local functions for colorizing single-color images */
@@ -121,15 +120,13 @@ QIcon PlatformStyle::TextColorIcon(const QIcon& icon) const
 
 const PlatformStyle *PlatformStyle::instantiate(const QString &platformId)
 {
-    for (unsigned x=0; x<platform_styles_count; ++x)
-    {
-        if (platformId == platform_styles[x].platformId)
-        {
+    for (const auto& platform_style : platform_styles) {
+        if (platformId == platform_style.platformId) {
             return new PlatformStyle(
-                    platform_styles[x].platformId,
-                    platform_styles[x].imagesOnButtons,
-                    platform_styles[x].colorizeIcons,
-                    platform_styles[x].useExtraSpacing);
+                    platform_style.platformId,
+                    platform_style.imagesOnButtons,
+                    platform_style.colorizeIcons,
+                    platform_style.useExtraSpacing);
         }
     }
     return nullptr;
diff --git a/src/rest.cpp b/src/rest.cpp
index 678ffdb760..8e306ef6d6 100644
--- a/src/rest.cpp
+++ b/src/rest.cpp
@@ -19,7 +19,6 @@
 #include <txmempool.h>
 #include <util/check.h>
 #include <util/ref.h>
-#include <util/strencodings.h>
 #include <validation.h>
 #include <version.h>
 
@@ -117,9 +116,10 @@ static RetFormat ParseDataFormat(std::string& param, const std::string& strReq)
     param = strReq.substr(0, pos);
     const std::string suff(strReq, pos + 1);
 
-    for (unsigned int i = 0; i < ARRAYLEN(rf_names); i++)
-        if (suff == rf_names[i].name)
-            return rf_names[i].rf;
+    for (const auto& rf_name : rf_names) {
+        if (suff == rf_name.name)
+            return rf_name.rf;
+    }
 
     /* If no suffix is found, return original string.  */
     param = strReq;
@@ -129,12 +129,13 @@ static RetFormat ParseDataFormat(std::string& param, const std::string& strReq)
 static std::string AvailableDataFormatsString()
 {
     std::string formats;
-    for (unsigned int i = 0; i < ARRAYLEN(rf_names); i++)
-        if (strlen(rf_names[i].name) > 0) {
+    for (const auto& rf_name : rf_names) {
+        if (strlen(rf_name.name) > 0) {
             formats.append(".");
-            formats.append(rf_names[i].name);
+            formats.append(rf_name.name);
             formats.append(", ");
         }
+    }
 
     if (formats.length() > 0)
         return formats.substr(0, formats.length() - 2);
@@ -695,6 +696,7 @@ void InterruptREST()
 
 void StopREST()
 {
-    for (unsigned int i = 0; i < ARRAYLEN(uri_prefixes); i++)
-        UnregisterHTTPHandler(uri_prefixes[i].prefix, false);
+    for (const auto& up : uri_prefixes) {
+        UnregisterHTTPHandler(up.prefix, false);
+    }
 }
diff --git a/src/test/miner_tests.cpp b/src/test/miner_tests.cpp
index e967273636..3e90bb054b 100644
--- a/src/test/miner_tests.cpp
+++ b/src/test/miner_tests.cpp
@@ -219,8 +219,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
     static_assert(sizeof(blockinfo) / sizeof(*blockinfo) == 110, "Should have 110 blocks to import");
     int baseheight = 0;
     std::vector<CTransactionRef> txFirst;
-    for (unsigned int i = 0; i < sizeof(blockinfo)/sizeof(*blockinfo); ++i)
-    {
+    for (const auto& bi : blockinfo) {
         CBlock *pblock = &pblocktemplate->block; // pointer for convenience
         {
             LOCK(cs_main);
@@ -229,7 +228,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
             CMutableTransaction txCoinbase(*pblock->vtx[0]);
             txCoinbase.nVersion = 1;
             txCoinbase.vin[0].scriptSig = CScript();
-            txCoinbase.vin[0].scriptSig.push_back(blockinfo[i].extranonce);
+            txCoinbase.vin[0].scriptSig.push_back(bi.extranonce);
             txCoinbase.vin[0].scriptSig.push_back(::ChainActive().Height());
             txCoinbase.vout.resize(1); // Ignore the (optional) segwit commitment added by CreateNewBlock (as the hardcoded nonces don't account for this)
             txCoinbase.vout[0].scriptPubKey = CScript();
@@ -239,7 +238,7 @@ BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
             if (txFirst.size() < 4)
                 txFirst.push_back(pblock->vtx[0]);
             pblock->hashMerkleRoot = BlockMerkleRoot(*pblock);
-            pblock->nNonce = blockinfo[i].nonce;
+            pblock->nNonce = bi.nonce;
         }
         std::shared_ptr<const CBlock> shared_pblock = std::make_shared<const CBlock>(*pblock);
         BOOST_CHECK(Assert(m_node.chainman)->ProcessNewBlock(chainparams, shared_pblock, true, nullptr));
-- 
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