Avoid string_view::clear:

String views are cleared using assignment from
braced initializion, to avoid calling clear().

CHANGELOG.md

@@ -4,6 +4,7 @@ Version 153:
 * Use make_error_code for setting an error_code from errc
 * Use boost::winapi::GetLastError() consistently 
 * Update README.md for branches
+* Avoid string_view::clear
 
 --------------------------------------------------------------------------------
 

include/boost/beast/http/detail/rfc7230.hpp

@@ -352,8 +352,8 @@ increment()
         {
             it = first;
         };
-    v.first.clear();
-    v.second.clear();
+    v.first = {};
+    v.second = {};
     detail::skip_ows(it, last);
     first = it;
     if(it == last)

include/boost/beast/http/impl/fields.ipp

@@ -364,8 +364,8 @@ basic_fields(basic_fields&& other) noexcept
     , method_(other.method_)
     , target_or_reason_(other.target_or_reason_)
 {
-    other.method_.clear();
-    other.target_or_reason_.clear();
+    other.method_ = {};
+    other.target_or_reason_ = {};
 }
 
 template<class Allocator>
@@ -1221,7 +1221,7 @@ realloc_string(string_view& dest, string_view s)
     {
         a.deallocate(const_cast<char*>(
             dest.data()), dest.size());
-        dest.clear();
+        dest = {};
     }
     if(! s.empty())
     {
@@ -1249,7 +1249,7 @@ realloc_target(
     {
         a.deallocate(const_cast<char*>(
             dest.data()), dest.size());
-        dest.clear();
+        dest = {};
     }
     if(! s.empty())
     {
@@ -1305,8 +1305,8 @@ move_assign(basic_fields& other, std::true_type)
     list_ = std::move(other.list_);
     method_ = other.method_;
     target_or_reason_ = other.target_or_reason_;
-    other.method_.clear();
-    other.target_or_reason_.clear();
+    other.method_ = {};
+    other.target_or_reason_ = {};
     this->member() = other.member();
 }
 
@@ -1328,8 +1328,8 @@ move_assign(basic_fields& other, std::false_type)
         list_ = std::move(other.list_);
         method_ = other.method_;
         target_or_reason_ = other.target_or_reason_;
-        other.method_.clear();
-        other.target_or_reason_.clear();
+        other.method_ = {};
+        other.target_or_reason_ = {};
     }
 }