| # | Line 59 | Line 59 | class ForceFieldFactory { | |
|---|---|---|
| 59 | * Returns an instance of ForceField factory | |
| 60 | * @return an instance of ForceField factory | |
| 61 | */ | |
| 62 | < | static ForceFieldFactory* getInstance(); |
| 62 | > | static ForceFieldFactory* getInstance() { |
| 63 | ||
| 64 | + | if (instance_ == NULL) { |
| 65 | + | instance_ = new ForceFieldFactory(); |
| 66 | + | } |
| 67 | + | return instance_; |
| 68 | + | |
| 69 | + | } |
| 70 | + | |
| 71 | /** | |
| 72 | * Registers a creator with a type identifier | |
| 73 | * @return true if registration is succeed, otherwise return false | |
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