Simplify deinit existence check and improve code format.

src/collection.zig

@@ -2,8 +2,7 @@ const std = @import("std");
 
 /// Collection of pointers of a certain type.
 /// A collection manages memory of the contained type.
-pub fn Collection(comptime T: anytype) type
-{
+pub fn Collection(comptime T: anytype) type {
 	return struct {
 		const Self = @This();
 
@@ -15,8 +14,7 @@ pub fn Collection(comptime T: anytype) type
 		/// Initialize a new collection of values.
 		/// Values are now owned by the collection and will free them when it is deinitialized.
 		/// The allocator must be the one that manages the slice and its items.
-		pub fn init(allocator: std.mem.Allocator, values: []*T) Self
-		{
+		pub fn init(allocator: std.mem.Allocator, values: []*T) Self {
 			return .{
 				.allocator = allocator,
 				// Store given values in items slice.
@@ -25,17 +23,17 @@ pub fn Collection(comptime T: anytype) type
 		}
 
 		/// Free any pointer value.
-		fn freeAnyPointer(self: *Self, pointer: anytype) void
-		{
+		fn freeAnyPointer(self: *Self, pointer: anytype) void {
 			// Get type info of the current pointer.
 			const pointedTypeInfo = @typeInfo(@TypeOf(pointer.*));
 
-			switch (pointedTypeInfo)
-			{
-				.Struct, .Enum, .Union, .Opaque => {
+			switch (pointedTypeInfo) {
+				// It's a simple pointer, freeing its value recursively.
+				.Pointer => self.freeAnyValue(pointer.*),
+				else => {
 					// If type is a container with a deinit, run deinit.
-					if (@hasDecl(@TypeOf(pointer.*), "deinit"))
-						{ // The container has a specific deinit, running it.
+					if (std.meta.hasFn(@TypeOf(pointer.*), "deinit")) {
+						// The container has a specific deinit, running it.
 						pointer.deinit();
 						//TODO implement something like that.
 						//switch (@TypeOf(pointer.deinit).@"fn".return_type)
@@ -48,12 +46,6 @@ pub fn Collection(comptime T: anytype) type
 						//	},
 						//}
 					}
-				},
-				.Pointer => {
-					// It's a simple pointer, freeing its value recursively.
-					self.freeAnyValue(pointer.*);
-				},
-				else => {
 					// Otherwise, we consider it as a simple value, there is nothing to free.
 				},
 			}
@@ -63,23 +55,21 @@ pub fn Collection(comptime T: anytype) type
 		}
 
 		/// Free any value.
-		fn freeAnyValue(self: *Self, value: anytype) void
-		{
+		fn freeAnyValue(self: *Self, value: anytype) void {
 			// Get type info of the current pointer.
 			const typeInfo = @typeInfo(@TypeOf(value));
 
-			switch (typeInfo)
-			{
+			switch (typeInfo) {
 				.Pointer => |pointerInfo| {
 					// Can be a slice or a simple pointer.
-					if (pointerInfo.size == .One)
-						{ // It's a simple pointer, freeing its value recursively.
+					if (pointerInfo.size == .One) {
+						// It's a simple pointer, freeing its value recursively.
 						self.freeAnyPointer(value);
 					}
-					else
-						{ // It's a slice, free every item then free it.
-							for (value) |item|
-							{ // For each item, free it recursively.
+					else {
+						// It's a slice, free every item then free it.
+						for (value) |item| {
+							// Free each item recursively.
 							self.freeAnyValue(item);
 						}
 
@@ -87,15 +77,13 @@ pub fn Collection(comptime T: anytype) type
 						self.allocator.free(value);
 					}
 				},
-				else => {
 				// Otherwise, we consider it as a simple value, nothing to free.
-				},
+				else => {},
 			}
 		}
 
 		/// Deinitialize the collection of values and all its values.
-		pub fn deinit(self: *Self) void
-		{
+		pub fn deinit(self: *Self) void {
 			// Deinitialize all items.
 			for (self.items) |item|
 			{ // For each items, try to free it.