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| #include <mutex> | |
| class MySingleton { | |
| public: | |
| static MySingleton * GetInstance() { | |
| std::call_once( | |
| m_flag, | |
| [] () { m_instance = new MySingleton(); } | |
| ); | |
zno5
/ map_emplace_example.cpp
Created
March 27, 2017 05:10
map, emplace w/o creating a object temporarily
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| struct Item { | |
| int m_val1; | |
| int m_val2; | |
| Item (int val1, int val2) { | |
| m_val1 = val1; | |
| m_val2 = val2; | |
| } | |
| }; |
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| template <typename ... Ts> | |
| struct ParamPack; | |
| template <> | |
| struct ParamPack<> { | |
| static constexpr size_t count = 0; | |
| }; | |
| template <typename T, typename ... Ts> | |
| struct ParamPack<T, Ts...> { |
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| /* | |
| Usage: | |
| class Test; | |
| bool Finalize (); | |
| bool Finalize (int i); | |
| bool Finalize (int i, int j); | |
| { |
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