package atlas

import (
	"fmt"
	"reflect"
)

func Build(entries ...AtlasEntry) (Atlas, error) {
	atl := Atlas{
		mappings: make(map[uintptr]*AtlasEntry),
	}
	for _, entry := range entries {
		rtid := reflect.ValueOf(entry.Type).Pointer()
		if _, exists := atl.mappings[rtid]; exists {
			return Atlas{}, fmt.Errorf("repeated entry for %v", entry.Type)
		}
		atl.mappings[rtid] = &entry
	}
	return atl, nil
}
func MustBuild(entries ...AtlasEntry) Atlas {
	atl, err := Build(entries...)
	if err != nil {
		panic(err)
	}
	return atl
}

func BuildEntry(typeHintObj interface{}) *BuilderCore {
	return &BuilderCore{
		&AtlasEntry{Type: reflect.TypeOf(typeHintObj)},
	}
}

/*
	Intermediate step in building an AtlasEntry: use `BuildEntry` to
	get one of these to start with, then call one of the methods
	on this type to get a specialized builder which has the methods
	relevant for setting up that specific kind of mapping.
*/
type BuilderCore struct {
	entry *AtlasEntry
}

package atlas

import (
	"fmt"
	"reflect"
)

func Build(entries ...AtlasEntry) (Atlas, error) {
	atl := Atlas{
		mappings: make(map[uintptr]*AtlasEntry),
	}
	for _, entry := range entries {
		rtid := reflect.ValueOf(entry.Type).Pointer()
		if _, exists := atl.mappings[rtid]; exists {
			return Atlas{}, fmt.Errorf("repeated entry for %v", entry.Type)
		}
		atl.mappings[rtid] = &entry
	}
	return atl, nil
}

func BuildEntry(typeHintObj interface{}) *BuilderCore {
	return &BuilderCore{
		&AtlasEntry{Type: reflect.TypeOf(typeHintObj)},
	}
}

/*
	Intermediate step in building an AtlasEntry: use `BuildEntry` to
	get one of these to start with, then call one of the methods
	on this type to get a specialized builder which has the methods
	relevant for setting up that specific kind of mapping.
*/
type BuilderCore struct {
	entry *AtlasEntry
}

--- 
+++ 
@@ -18,6 +18,13 @@
 	}
 	return atl, nil
 }
+func MustBuild(entries ...AtlasEntry) Atlas {
+	atl, err := Build(entries...)
+	if err != nil {
+		panic(err)
+	}
+	return atl
+}
 
 func BuildEntry(typeHintObj interface{}) *BuilderCore {
 	return &BuilderCore{
Add atlas.MustBuild, for those times when you really want a single return value.

Signed-off-by: Eric Myhre <2346ad27d7568ba9896f1b7da6b5991251debdf2@exultant.us>
