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Question

I there a compiler option I could use in CC compiler to get the following code (which compiles fine in Visual C++)

std::vector<std::vector<double>> v2;

without the following error

Error: "," expected instead of ">>"

Answer 1

Try this :

std::vector<std::vector<double> > v2; //give a space between two '>'

" >> " is interpreted as the right shift operator and hence you get a compile time error.

This problem will be fixed in C++0x. Have a look here .

Answer 2

You need a space between the two greater-than signs:

std::vector<std::vector<double> > v2;

Otherwise, the ">>" is treated as a single token.

Answer 3

std::vector<std::vector<double> > v2;

你需要添加一个空格，否则它将被解释为>>运算符。