Question

I have a

struct OpDesc {
        std::string  OPName;
        size_t       OPArgsMin;
        bool         IsVaribaleArgsNum;
        bool         IsOPChange;
        std::string  ChangeNodeOP;
        std::string  ChangeNodeLabel;
        bool         IsOPDelete;
        const char*  ErrMsg;
    };

And want to init a std::map<string, OpDesc>.

I tried doing it this way :

typedef std::map<std::string,struct OpDesc> OpDescMap;
OpDescMap opDesc;
opDesc["StoreOp"] = {"StoreOp",2,false,false,"","",false,""};
/// etc.

I can’t compile that with VS10. I get : error C2059: syntax error : '{'

How can it be solved?

Answer 1

Your syntax is valid C++11 (see Uniform Initialization), however, VS10 does not support it. It was only added to VS12 (see C++ features in VS2012). One option is to upgrade your compiler to one that has better conformance to C++11.

If you can’t upgrade, you’ll have to fallback to C++03 syntax. You can either use an intermediate variable:

OpDesc op = {"StoreOp", 2, false, false, "", "", false, ""};
opDesc[op.OPName] = op;

Or add a constructor to your structure:

struct OpDesc {
   // ... all fields
   OpDesc(std::string const& opName, size_t opArgsMin, bool isVariableArgsNum,
          bool isOpChange, std::string const& changeNameOp,
          std::string const& changeNodeLabel, bool isOpDelete,
          char const* errMsg)
   : OPName(opName), OPArgsMin(opArgsMin), IsVariableArgsNum(isVariableArgsNum),
     IsOpChange(isOpChange), ChangeNameOp(changeNameOp),
     ChangeNodeLabel(changeNodeLabel), IsOpDelete(isOpDelete),
     ErrMsg(errMsg) {}
};

opDesc["StoreOp"] = OpDesc("StoreOp", 2, false, false, "", "", false, "");