Index: src/ch/ch.vc140.vcxproj
===================================================================
diff -u -N -r2e4eacb299f21d06196fe13140b4b0d095abdca9 -r318ace3ec2b5cf68de6aeb5a04b56c4389565e5a
--- src/ch/ch.vc140.vcxproj	(.../ch.vc140.vcxproj)	(revision 2e4eacb299f21d06196fe13140b4b0d095abdca9)
+++ src/ch/ch.vc140.vcxproj	(.../ch.vc140.vcxproj)	(revision 318ace3ec2b5cf68de6aeb5a04b56c4389565e5a)
@@ -192,7 +192,7 @@
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       <AdditionalOptions>/Zm150 /Zc:threadSafeInit- %(AdditionalOptions)</AdditionalOptions>
       <Optimization>Disabled</Optimization>
-      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_CRT_SECURE_NO_DEPRECATE;_BIND_TO_CURRENT_VCLIBS_VERSION=1;_SCL_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_CRT_SECURE_NO_DEPRECATE;_BIND_TO_CURRENT_VCLIBS_VERSION=1;_SCL_SECURE_NO_WARNINGS;_SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
       <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
       <PrecompiledHeader>Use</PrecompiledHeader>
@@ -204,6 +204,7 @@
       <EnableEnhancedInstructionSet>NoExtensions</EnableEnhancedInstructionSet>
       <DisableSpecificWarnings>4714</DisableSpecificWarnings>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <LanguageStandard>stdcpp17</LanguageStandard>
     </ClCompile>
     <ResourceCompile>
       <PreprocessorDefinitions>_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
@@ -232,7 +233,7 @@
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       <Optimization>Disabled</Optimization>
       <AdditionalIncludeDirectories>..\..\ext\googletest\googletest\include;..\..\ext\googletest\googlemock\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_CRT_SECURE_NO_DEPRECATE;_BIND_TO_CURRENT_VCLIBS_VERSION=1;_SCL_SECURE_NO_WARNINGS;TESTING;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_CRT_SECURE_NO_DEPRECATE;_BIND_TO_CURRENT_VCLIBS_VERSION=1;_SCL_SECURE_NO_WARNINGS;TESTING;_CONSOLE;_SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
       <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
       <PrecompiledHeader>Use</PrecompiledHeader>
@@ -244,6 +245,7 @@
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       <DisableSpecificWarnings>4714</DisableSpecificWarnings>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <LanguageStandard>stdcpp17</LanguageStandard>
     </ClCompile>
     <ResourceCompile>
       <PreprocessorDefinitions>_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
@@ -275,7 +277,7 @@
       <AdditionalOptions>/Zm150 /Zc:threadSafeInit- %(AdditionalOptions)</AdditionalOptions>
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       <AdditionalIncludeDirectories>%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_CRT_SECURE_NO_DEPRECATE;_BIND_TO_CURRENT_VCLIBS_VERSION=1;_SCL_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_CRT_SECURE_NO_DEPRECATE;_BIND_TO_CURRENT_VCLIBS_VERSION=1;_SCL_SECURE_NO_WARNINGS;_SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
       <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
       <PrecompiledHeader>Use</PrecompiledHeader>
@@ -287,6 +289,7 @@
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       <MinimalRebuild>false</MinimalRebuild>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <LanguageStandard>stdcpp17</LanguageStandard>
     </ClCompile>
     <ResourceCompile>
       <PreprocessorDefinitions>_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
@@ -315,7 +318,7 @@
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       <AdditionalIncludeDirectories>..\..\ext\googletest\googletest\include;..\..\ext\googletest\googlemock\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_CRT_SECURE_NO_DEPRECATE;_BIND_TO_CURRENT_VCLIBS_VERSION=1;_SCL_SECURE_NO_WARNINGS;TESTING;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_CRT_SECURE_NO_DEPRECATE;_BIND_TO_CURRENT_VCLIBS_VERSION=1;_SCL_SECURE_NO_WARNINGS;TESTING;_CONSOLE;_SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
       <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
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@@ -327,6 +330,7 @@
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       <MinimalRebuild>false</MinimalRebuild>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <LanguageStandard>stdcpp17</LanguageStandard>
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     <ResourceCompile>
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@@ -358,7 +362,7 @@
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       <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_CRT_SECURE_NO_DEPRECATE;_BIND_TO_CURRENT_VCLIBS_VERSION=1;_SCL_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_CRT_SECURE_NO_DEPRECATE;_BIND_TO_CURRENT_VCLIBS_VERSION=1;_SCL_SECURE_NO_WARNINGS;_SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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       <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
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@@ -370,6 +374,7 @@
       <DisableSpecificWarnings>4714</DisableSpecificWarnings>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
       <EnableEnhancedInstructionSet>NoExtensions</EnableEnhancedInstructionSet>
+      <LanguageStandard>stdcpp17</LanguageStandard>
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@@ -399,7 +404,7 @@
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-      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_CRT_SECURE_NO_DEPRECATE;_BIND_TO_CURRENT_VCLIBS_VERSION=1;_SCL_SECURE_NO_WARNINGS;TESTING;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_CRT_SECURE_NO_DEPRECATE;_BIND_TO_CURRENT_VCLIBS_VERSION=1;_SCL_SECURE_NO_WARNINGS;TESTING;_CONSOLE;_SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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@@ -411,6 +416,7 @@
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       <DisableSpecificWarnings>4714</DisableSpecificWarnings>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <LanguageStandard>stdcpp17</LanguageStandard>
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@@ -442,7 +448,7 @@
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       <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_CRT_SECURE_NO_DEPRECATE;_BIND_TO_CURRENT_VCLIBS_VERSION=1;_SCL_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_CRT_SECURE_NO_DEPRECATE;_BIND_TO_CURRENT_VCLIBS_VERSION=1;_SCL_SECURE_NO_WARNINGS;_SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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@@ -453,6 +459,7 @@
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       <DisableSpecificWarnings>4714</DisableSpecificWarnings>
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+      <LanguageStandard>stdcpp17</LanguageStandard>
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@@ -482,7 +489,7 @@
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+      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_CRT_SECURE_NO_DEPRECATE;_BIND_TO_CURRENT_VCLIBS_VERSION=1;_SCL_SECURE_NO_WARNINGS;TESTING;_CONSOLE;_SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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@@ -493,6 +500,7 @@
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       <DisableSpecificWarnings>4714</DisableSpecificWarnings>
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