const slice in file api

Author: TheNumbat

rpp/files.h

@@ -10,7 +10,7 @@ using Alloc = Mallocator<"File IO">;
 using File_Time = u64;
 
 [[nodiscard]] Opt<Vec<u8, Alloc>> read(String_View path) noexcept;
-[[nodiscard]] bool write(String_View path, Slice<u8> data) noexcept;
+[[nodiscard]] bool write(String_View path, Slice<const u8> data) noexcept;
 
 [[nodiscard]] Opt<File_Time> last_write_time(String_View path) noexcept;
 

rpp/slice.h

@@ -118,7 +118,9 @@ struct Slice {
         return Slice{data_ + start, length};
     }
 
-    [[nodiscard]] Slice<u8> to_bytes() noexcept {
+    [[nodiscard]] Slice<u8> to_bytes() noexcept
+        requires(!Const<T>)
+    {
         Slice<u8> ret;
         ret.data_ = launder(reinterpret_cast<u8*>(data_));
         ret.length_ = length_ * sizeof(T);

rpp/w32/files_w32.cpp

@@ -72,7 +72,7 @@ namespace rpp::Files {
     return Opt{rpp::move(data)};
 }
 
-[[nodiscard]] bool write(String_View path, Slice<u8> data) noexcept {
+[[nodiscard]] bool write(String_View path, Slice<const u8> data) noexcept {
 
     auto [ucs2_path, ucs2_path_len] = utf8_to_ucs2(path);
     if(ucs2_path_len == 0) {