more array changes to fight leaks.

Author: mike-ward

examples/showcase.v

@@ -1342,11 +1342,13 @@ fn icon_catalog(mut w gui.Window) gui.View {
 
 	// Break the icons_maps into rows
 	chunks := chunk_map(gui.icons_map, 4)
-	mut all_icons := []gui.View{}
+	mut all_icons := []gui.View{cap: chunks.len}
+	unsafe { all_icons.flags.set(.noslices) }
+	defer { unsafe { all_icons.flags.clear(.noslices) } }
 
 	// create rows of icons/text
 	for chunk in chunks {
-		mut icons := []gui.View{}
+		mut icons := []gui.View{cap: chunk.len}
 		unsafe { icons.flags.set(.noslices) }
 		defer { unsafe { icons.flags.clear(.noslices) } }
 		for key, val in chunk {
@@ -1377,7 +1379,7 @@ fn icon_catalog(mut w gui.Window) gui.View {
 
 // maybe this should be a standard library function?
 fn chunk_map[K, V](input map[K]V, chunk_size int) []map[K]V {
-	mut chunks := []map[K]V{}
+	mut chunks := []map[K]V{cap: input.keys().len / chunk_size + 1}
 	unsafe { chunks.flags.set(.noslices) }
 	defer { unsafe { chunks.flags.clear(.noslices) } }
 	mut current_chunk := map[K]V{}

text_tools.v

@@ -169,11 +169,12 @@ fn split_text(s string, tab_size u32) []string {
 	state_sp := 1
 
 	mut state := state_ch
-	mut fields := []string{}
-	fields.ensure_cap(100)
+	mut fields := []string{cap: 100}
 	unsafe { fields.flags.set(.noslices) }
 	defer { unsafe { fields.flags.clear(.noslices) } }
-	mut field := []rune{}
+	mut field := []rune{cap: 50}
+	unsafe { field.flags.set(.noslices) }
+	defer { unsafe { field.flags.clear(.noslices) } }
 	for r in s.runes_iterator() {
 		if state == state_ch {
 			if r == r_space {

view_container.v

@@ -215,8 +215,7 @@ fn container(cfg &ContainerCfg) View {
 			padding:   padding_none
 		}
 	}
-	mut content := []View{}
-	content.ensure_cap(cfg.content.len + 3)
+	mut content := []View{cap: cfg.content.len + 3}
 	unsafe { content.flags.set(.noslices) }
 	defer { unsafe { content.flags.clear(.noslices) } }
 

view_text.v

@@ -314,6 +314,8 @@ fn (cfg &TextCfg) copy(shape &Shape, w &Window) ?string {
 			else {
 				mut count := 0
 				mut buffer := []rune{cap: 100}
+				unsafe { buffer.flags.set(.noslices) }
+				defer { unsafe { buffer.flags.clear(.noslices) } }
 				beg := int(input_state.select_beg)
 				end := int(input_state.select_end)
 				for line in shape.text_lines {

window.v

@@ -230,7 +230,7 @@ pub fn (mut window Window) update_view(gen_view fn (&Window) View) {
 	// reference to render array significantly reduced calls to array.push()
 	view := gen_view(window)
 	mut layout := window.compose_layout(view)
-	mut renderers := []Renderer{}
+	mut renderers := []Renderer{cap: 200}
 	unsafe { renderers.flags.set(.noslices) }
 	defer { unsafe { renderers.flags.clear(.noslices) } }
 	window_rect := window.window_rect()
@@ -258,7 +258,7 @@ pub fn (mut window Window) update_window() {
 
 	view := window.view_generator(window)
 	mut layout := window.compose_layout(view)
-	mut renderers := []Renderer{}
+	mut renderers := []Renderer{cap: 200}
 	unsafe { renderers.flags.set(.noslices) }
 	defer { unsafe { renderers.flags.clear(.noslices) } }
 	window_rect := window.window_rect()