Backport: Tighten definition of regular expression iterators so they are noexcept and

define all the standard member functions. This cascades to all methods called
by the iterators, affecting Document, CellBuffer, Partitioning, SplitVector and
UTF-8 and DBCS functions.
Other trivial functions declared noexcept.

Backport of changeset 6724:f2dfdc0dddd3.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/UniConversion.cxx b/src/UniConversion.cxx
index 880b3132f..04b8891cb 100644
--- a/src/UniConversion.cxx
+++ b/src/UniConversion.cxx
@@ -218,7 +218,7 @@ size_t UTF32FromUTF8(const char *s, size_t len, unsigned int *tbuf, size_t tlen)
 	return ui;
 }
 
-unsigned int UTF16FromUTF32Character(unsigned int val, wchar_t *tbuf) {
+unsigned int UTF16FromUTF32Character(unsigned int val, wchar_t *tbuf) noexcept {
 	if (val < SUPPLEMENTAL_PLANE_FIRST) {
 		tbuf[0] = static_cast<wchar_t>(val);
 		return 1;
@@ -254,7 +254,7 @@ const unsigned char UTF8BytesOfLead[256] = {
 // the non-characters *FFFE, *FFFF and FDD0 .. FDEF return 3 or 4 as they can be
 // reasonably treated as code points in some circumstances. They will, however,
 // not have associated glyphs.
-int UTF8Classify(const unsigned char *us, int len) {
+int UTF8Classify(const unsigned char *us, int len) noexcept {
 	// For the rules: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
 	if (us[0] < 0x80) {
 		// ASCII
@@ -325,7 +325,7 @@ int UTF8Classify(const unsigned char *us, int len) {
 	return UTF8MaskInvalid | 1;
 }
 
-int UTF8DrawBytes(const unsigned char *us, int len) {
+int UTF8DrawBytes(const unsigned char *us, int len) noexcept {
 	const int utf8StatusNext = UTF8Classify(us, len);
 	return (utf8StatusNext & UTF8MaskInvalid) ? 1 : (utf8StatusNext & UTF8MaskWidth);
 }