Add support for building with meson

Also fix an import in taggedalgebraic.d

meson.build

@@ -0,0 +1,13 @@
+project('taggedalgebraic', 'd',
+    meson_version: '>=0.50',
+    version: '0.11.9'
+)
+
+project_soversion      = '0'
+project_version_suffix = ''
+project_version        = meson.project_version()
+project_version_full   = project_version + project_version_suffix
+
+source_root = meson.source_root()
+build_root = meson.build_root()
+subdir('source/taggedalgebraic')

source/taggedalgebraic/meson.build

@@ -0,0 +1,35 @@
+taggedalgebraic_src = [
+	'taggedalgebraic.d',
+	'taggedunion.d',
+	'visit.d',
+]
+
+taggedalgebraic_lib = library(
+	'taggedalgebraic',
+	taggedalgebraic_src,
+	version: project_version,
+	install: true,
+	include_directories: include_directories('../')
+)
+
+pkgc = import('pkgconfig')
+
+pkgc.generate(
+	taggedalgebraic_lib,
+	subdirs: 'd/taggedalgebraic',
+)
+
+install_headers(
+	taggedalgebraic_src,
+	subdir: 'd/taggedalgebraic/taggedalgebraic',
+)
+
+test_exe = executable(
+	'taggedalgebraic_test',
+	taggedalgebraic_src,
+	include_directories: include_directories('../'),
+	d_unittest: true,
+	link_args: '-main',
+)
+
+test('test_taggedalgebraic', test_exe)

source/taggedalgebraic/taggedalgebraic.d

@@ -139,7 +139,7 @@ struct TaggedAlgebraic(U) if (is(U == union) || is(U == struct) || is(U == enum)
 ///
 @safe unittest
 {
-	import taggedalgebraic;
+	import taggedalgebraic.taggedalgebraic;
 
 	struct Foo {
 		string name;