util/AllocatedString: add string_view constructor

Replaces the static Duplicate() method.

src/lib/icu/CaseFold.cxx

@@ -44,7 +44,7 @@ try {
 #ifdef HAVE_ICU
 	const auto u = UCharFromUTF8(src);
 	if (u.IsNull())
-		return AllocatedString::Duplicate(src);
+		return AllocatedString(src);
 
 	AllocatedArray<UChar> folded(u.size() * 2U);
 
@@ -54,7 +54,7 @@ try {
 					     U_FOLD_CASE_DEFAULT,
 					     &error_code);
 	if (folded_length == 0 || error_code != U_ZERO_ERROR)
-		return AllocatedString::Duplicate(src);
+		return AllocatedString(src);
 
 	folded.SetSize(folded_length);
 	return UCharToUTF8({folded.begin(), folded.size()});
@@ -63,7 +63,7 @@ try {
 #error not implemented
 #endif
 } catch (...) {
-	return AllocatedString::Duplicate(src);
+	return AllocatedString(src);
 }
 
 #endif /* HAVE_ICU_CASE_FOLD */

src/lib/icu/Compare.cxx

@@ -46,7 +46,7 @@ IcuCompare::IcuCompare(std::string_view _needle) noexcept
 #else
 
 IcuCompare::IcuCompare(std::string_view _needle) noexcept
-	:needle(AllocatedString::Duplicate(_needle)) {}
+	:needle(_needle) {}
 
 #endif
 

src/lib/icu/Converter.cxx

@@ -95,7 +95,7 @@ DoConvert(iconv_t conv, std::string_view src)
 	if (in_left > 0)
 		throw std::runtime_error("Charset conversion failed");
 
-	return AllocatedString::Duplicate({buffer, sizeof(buffer) - out_left});
+	return AllocatedString({buffer, sizeof(buffer) - out_left});
 }
 
 #endif
@@ -151,7 +151,7 @@ IcuConverter::FromUTF8(std::string_view s) const
 		throw std::runtime_error(FormatString("Failed to convert from Unicode: %s",
 						      u_errorName(code)).c_str());
 
-	return AllocatedString::Duplicate({buffer, size_t(target - buffer)});
+	return AllocatedString({buffer, size_t(target - buffer)});
 
 #elif defined(HAVE_ICONV)
 	return DoConvert(from_utf8, s);