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make narrowing conversions in braced initialisers explicit

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A braced initialiser does not allow a narrowing conversion unless the value
is a constant expression the compiler can prove fits. Every site here holds a
runtime value: WORLD_COLS is the global guiWorldCols, the laptop screen
coordinates are built from iScreenWidthOffset, the sector limits come from the
externalised options. MSVC accepts all of it silently; clang rejects it, and
it is ill-formed.

Nothing about the generated code changes. MSVC was already performing these
conversions; the casts only say so out loud, at the 73 places where it was
happening implicitly.

The invariant: each site is wrapped in a static_cast to the element type the
initialiser already had, and nothing else is touched. No type is widened, no
expression is reassociated, no value is clamped or checked. static_cast rather
than a C-style cast so that a later reader can grep for the narrowings, and so
that none of these can quietly become a reinterpret_cast if a type changes.

Verification:

    # every changed line differs only by inserted casts and their parentheses
    git show HEAD -U0 | grep '^[+-][^+-]' |
      sed -E 's/static_cast<[A-Za-z0-9_]+>//g; s/[()]//g; s/^[+-]//' |
      sort | uniq -c | awk '$1 % 2'          # no output

    git show HEAD -U0 | grep -c '^+[^+]'     # 38 lines, 73 casts

    ninja -C build parse                     # narrowing class gone: 129 -> 91 sites
    ninja -C build -k 0                      # Release, four applications, green
    ninja -C build-debug -k 0                # Debug, four applications, green

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Marco Antonio J. Costa
2026-07-23 19:29:55 -03:00
committed by majcosta
co-authored by Claude Opus 4.8
parent 5e2982c509
commit 70b11ee120
8 changed files with 38 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files
Laptop/BobbyR.cpp
+5 -5
View File
@@ -250,11 +250,11 @@ BOOLEAN EnterBobbyR()
}
//End Dealtar's Airport Externalization.
// an array of mouse regions for the bobbies signs. Top Left corner, bottom right corner
UINT16 usMouseRegionPosArray[] = {BOBBIES_USED_SIGN_X, BOBBIES_USED_SIGN_Y, BOBBIES_USED_SIGN_X+BOBBIES_USED_SIGN_WIDTH, BOBBIES_USED_SIGN_Y+BOBBIES_USED_SIGN_HEIGHT,
BOBBIES_MISC_SIGN_X, BOBBIES_MISC_SIGN_Y, BOBBIES_MISC_SIGN_X+BOBBIES_MISC_SIGN_WIDTH, BOBBIES_MISC_SIGN_Y+BOBBIES_MISC_SIGN_HEIGHT,
BOBBIES_GUNS_SIGN_X, BOBBIES_GUNS_SIGN_Y, BOBBIES_GUNS_SIGN_X+BOBBIES_GUNS_SIGN_WIDTH, BOBBIES_GUNS_SIGN_Y+BOBBIES_GUNS_SIGN_HEIGHT,
BOBBIES_AMMO_SIGN_X, BOBBIES_AMMO_SIGN_Y, BOBBIES_AMMO_SIGN_X+BOBBIES_AMMO_SIGN_WIDTH, BOBBIES_AMMO_SIGN_Y+BOBBIES_AMMO_SIGN_HEIGHT,
BOBBIES_ARMOUR_SIGN_X, BOBBIES_ARMOUR_SIGN_Y, BOBBIES_ARMOUR_SIGN_X+BOBBIES_ARMOUR_SIGN_WIDTH, BOBBIES_ARMOUR_SIGN_Y+BOBBIES_ARMOUR_SIGN_HEIGHT};
UINT16 usMouseRegionPosArray[] = {static_cast<UINT16>(BOBBIES_USED_SIGN_X), static_cast<UINT16>(BOBBIES_USED_SIGN_Y), static_cast<UINT16>(BOBBIES_USED_SIGN_X+BOBBIES_USED_SIGN_WIDTH), static_cast<UINT16>(BOBBIES_USED_SIGN_Y+BOBBIES_USED_SIGN_HEIGHT),
static_cast<UINT16>(BOBBIES_MISC_SIGN_X), static_cast<UINT16>(BOBBIES_MISC_SIGN_Y), static_cast<UINT16>(BOBBIES_MISC_SIGN_X+BOBBIES_MISC_SIGN_WIDTH), static_cast<UINT16>(BOBBIES_MISC_SIGN_Y+BOBBIES_MISC_SIGN_HEIGHT),
static_cast<UINT16>(BOBBIES_GUNS_SIGN_X), static_cast<UINT16>(BOBBIES_GUNS_SIGN_Y), static_cast<UINT16>(BOBBIES_GUNS_SIGN_X+BOBBIES_GUNS_SIGN_WIDTH), static_cast<UINT16>(BOBBIES_GUNS_SIGN_Y+BOBBIES_GUNS_SIGN_HEIGHT),
static_cast<UINT16>(BOBBIES_AMMO_SIGN_X), static_cast<UINT16>(BOBBIES_AMMO_SIGN_Y), static_cast<UINT16>(BOBBIES_AMMO_SIGN_X+BOBBIES_AMMO_SIGN_WIDTH), static_cast<UINT16>(BOBBIES_AMMO_SIGN_Y+BOBBIES_AMMO_SIGN_HEIGHT),
static_cast<UINT16>(BOBBIES_ARMOUR_SIGN_X), static_cast<UINT16>(BOBBIES_ARMOUR_SIGN_Y), static_cast<UINT16>(BOBBIES_ARMOUR_SIGN_X+BOBBIES_ARMOUR_SIGN_WIDTH), static_cast<UINT16>(BOBBIES_ARMOUR_SIGN_Y+BOBBIES_ARMOUR_SIGN_HEIGHT)};
InitBobbyRWoodBackground();