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singleton: add a public query for validity

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This commit is contained in:
Danny Robson 2020-01-28 14:13:12 +11:00
parent 46d19464b5
commit 44509498b7
1 changed files with 7 additions and 0 deletions
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7
singleton.hpp
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@ -27,6 +27,13 @@ namespace cruft {
static SelfT *instance; static SelfT *instance;
public: public:
static bool
valid (void) noexcept
{
return instance;
}
/// instantiates the one blessed value of this type. /// instantiates the one blessed value of this type.
/// ///
/// `instantiate` must be called once and once only before any calls /// `instantiate` must be called once and once only before any calls