diff --git a/packages/quicktype-core/src/language/CPlusPlus/CPlusPlusRenderer.ts b/packages/quicktype-core/src/language/CPlusPlus/CPlusPlusRenderer.ts
index 4b70339f2..de41ae263 100644
--- a/packages/quicktype-core/src/language/CPlusPlus/CPlusPlusRenderer.ts
+++ b/packages/quicktype-core/src/language/CPlusPlus/CPlusPlusRenderer.ts
@@ -926,23 +926,27 @@ export class CPlusPlusRenderer extends ConvenienceRenderer {
                 },
                 true,
                 false,
-                property.isOptional
+                // Since we're only generating this to compare types, whether its optional doesn't matter - we just
+                // need cppType() to spit out the actual underlying type, without wrapping it in the optional<>
+                // container.
+                false
             );
 
+            // Check the minMax values for truthiness or if they're equal to zero, as zero is a valid value too
             res.set(jsonName, [
                 this.constraintMember(jsonName),
                 "(",
-                minMax?.[0] && cppType === "int64_t" ? String(minMax[0]) : this._nulloptType,
+                (minMax?.[0] || minMax?.[0] === 0) && cppType === "int64_t" ? String(minMax[0]) : this._nulloptType,
                 ", ",
-                minMax?.[1] && cppType === "int64_t" ? String(minMax[1]) : this._nulloptType,
+                (minMax?.[1] || minMax?.[1] === 0) && cppType === "int64_t" ? String(minMax[1]) : this._nulloptType,
                 ", ",
-                minMax?.[0] && cppType === "double" ? String(minMax[0]) : this._nulloptType,
+                (minMax?.[0] || minMax?.[0] === 0) && cppType === "double" ? String(minMax[0]) : this._nulloptType,
                 ", ",
-                minMax?.[1] && cppType === "double" ? String(minMax[1]) : this._nulloptType,
+                (minMax?.[1] || minMax?.[1] === 0) && cppType === "double" ? String(minMax[1]) : this._nulloptType,
                 ", ",
-                minMaxLength?.[0] ? String(minMaxLength[0]) : this._nulloptType,
+                minMaxLength?.[0] || minMaxLength?.[0] === 0 ? String(minMaxLength[0]) : this._nulloptType,
                 ", ",
-                minMaxLength?.[1] ? String(minMaxLength[1]) : this._nulloptType,
+                minMaxLength?.[1] || minMaxLength?.[1] === 0 ? String(minMaxLength[1]) : this._nulloptType,
                 ", ",
                 pattern === undefined
                     ? this._nulloptType