Constructor error when initializing c++ vector with struct

Question

I am trying to initialize a vector of struct opcodeTable with 2 values as follow:

struct opcodeTableE {
        uint16_t opcode;
        uint16_t mask;
        void (chipCpu::*instruction)(uint16_t);
};

std::vector<opcodeTableE> opcodetable{
        {0x00E0, 0xFFFF, chipCpu::clearScreen},
        {0x00EE, 0xFFFF, chipCpu::returnFromSub}
};

But I get the following error:

no instance of constructor "std::vector<_Tp, _Alloc>::vector [with _Tp=chipCpu::opcodeTableE, _Alloc=std::allocator<chipCpu::opcodeTableE>]" matches the argument list -- argument types are: ({...}, {...})

NOTE: I am on C++14

songyuanyao · Accepted Answer · 2018-03-30 00:14:13Z

4

You need to use operator& to get the pointer to member function. e.g.

std::vector<opcodeTableE> opcodetable{
        {0x00E0, 0xFFFF, &chipCpu::clearScreen},
        {0x00EE, 0xFFFF, &chipCpu::returnFromSub}
};

LIVE

BTW: operator& is only optional when getting pointer to non-member function or static member function because of the function-to-pointer implicit conversion.

edited Mar 30, 2018 at 0:14

answered Mar 29, 2018 at 14:31

songyuanyao

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2 Comments

Knox Root Over a year ago

Here is what I got after doing it:

error: could not convert '{{224, 65535, &chipCpu::clearScreen}, {238, 65535, &chipCpu::returnFromSub}}' from '<brace-enclosed initializer list>' to 'std::vector<chipCpu::opcodeTableE>'

songyuanyao Over a year ago

@KnoxRoot Could you make an mcve which could be used to reproduce the error? I tried to make one here and it works fine.

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