refactor: Avoid passing span iterators when data pointers are expected

For Span, iterators are just raw data pointers. However, for std::span
they are not.

This change makes it explicit where data pointers are expected.

Otherwise, there could be a compile error later on:

  No known conversion from 'iterator' (aka '__normal_iterator<const std::byte *, std::span<const std::byte, 18446744073709551615>>') to 'std::byte *'.

Author: MarcoFalke

src/script/miniscript.h

@@ -1798,7 +1798,7 @@ inline NodeRef<Key> Parse(Span<const char> in, const Ctx& ctx)
         // Get threshold
         int next_comma = FindNextChar(in, ',');
         if (next_comma < 1) return false;
-        const auto k_to_integral{ToIntegral<int64_t>(std::string_view(in.begin(), next_comma))};
+        const auto k_to_integral{ToIntegral<int64_t>(std::string_view(in.data(), next_comma))};
         if (!k_to_integral.has_value()) return false;
         const int64_t k{k_to_integral.value()};
         in = in.subspan(next_comma + 1);
@@ -1954,15 +1954,15 @@ inline NodeRef<Key> Parse(Span<const char> in, const Ctx& ctx)
             } else if (Const("after(", in)) {
                 int arg_size = FindNextChar(in, ')');
                 if (arg_size < 1) return {};
-                const auto num{ToIntegral<int64_t>(std::string_view(in.begin(), arg_size))};
+                const auto num{ToIntegral<int64_t>(std::string_view(in.data(), arg_size))};
                 if (!num.has_value() || *num < 1 || *num >= 0x80000000L) return {};
                 constructed.push_back(MakeNodeRef<Key>(internal::NoDupCheck{}, ctx.MsContext(), Fragment::AFTER, *num));
                 in = in.subspan(arg_size + 1);
                 script_size += 1 + (*num > 16) + (*num > 0x7f) + (*num > 0x7fff) + (*num > 0x7fffff);
             } else if (Const("older(", in)) {
                 int arg_size = FindNextChar(in, ')');
                 if (arg_size < 1) return {};
-                const auto num{ToIntegral<int64_t>(std::string_view(in.begin(), arg_size))};
+                const auto num{ToIntegral<int64_t>(std::string_view(in.data(), arg_size))};
                 if (!num.has_value() || *num < 1 || *num >= 0x80000000L) return {};
                 constructed.push_back(MakeNodeRef<Key>(internal::NoDupCheck{}, ctx.MsContext(), Fragment::OLDER, *num));
                 in = in.subspan(arg_size + 1);
@@ -1974,7 +1974,7 @@ inline NodeRef<Key> Parse(Span<const char> in, const Ctx& ctx)
             } else if (Const("thresh(", in)) {
                 int next_comma = FindNextChar(in, ',');
                 if (next_comma < 1) return {};
-                const auto k{ToIntegral<int64_t>(std::string_view(in.begin(), next_comma))};
+                const auto k{ToIntegral<int64_t>(std::string_view(in.data(), next_comma))};
                 if (!k.has_value() || *k < 1) return {};
                 in = in.subspan(next_comma + 1);
                 // n = 1 here because we read the first WRAPPED_EXPR before reaching THRESH

src/streams.h

@@ -79,7 +79,7 @@ class VectorWriter
             memcpy(vchData.data() + nPos, src.data(), nOverwrite);
         }
         if (nOverwrite < src.size()) {
-            vchData.insert(vchData.end(), UCharCast(src.data()) + nOverwrite, UCharCast(src.end()));
+            vchData.insert(vchData.end(), UCharCast(src.data()) + nOverwrite, UCharCast(src.data() + src.size()));
         }
         nPos += src.size();
     }