John

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John has asked 27 questions and find answers to 13 problems.

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John questions

Why `std::string str(nullptr)` and `std::string str=nullptr` is wrong? Could someone explain the reasons in details?
The differences between `lua_pushstring` and `lua_pushliteral`
Is there any type defined in Standard Library which has copy constructor but doesn't have a move constructor?
Is there any potential problem I should be aware of when linking to dynamic libraries compiled by old version g++?
Class diagram for variable member with the type of `std::unqiue_ptr<T>`
Unlike STL and std::basic_string, why there is no default allocator for std::function
About the usage of "__GFP_COMP"?
Class diagram for variable member with the type of `std::vector<T>`
How to comprehend that "lua_Hook is called when it jumps back in the code(This event only happens while Lua is executing a Lua function.)"?
How to reduce the probability of page allocation failure?

John answers

Race condition example about shared_ptr
How does one represent multiple threads in a flow chart