C++ array creation problem specific to gcc 4.5

问题

The following code works under gcc versions 2.9 through 4.4 but not version 4.5:

 struct Pass {
 };

 int main(void){
 Pass **passes = new ( Pass (*[ 10 ]) );
 }

The specific error message with gcc 4.5 is:

prob.cc: In function ‘int main()’:
prob.cc:6:31: warning: lambda expressions only available with -std=c++0x or -std=gnu++0x
prob.cc:6:38: error: no matching function for call to ‘Pass::Pass(void (&)())’
prob.cc:2:1: note: candidates are: Pass::Pass()
prob.cc:2:1: note:                 Pass::Pass(const Pass&)

Adding the requested flag silences the initial warning but does not fix the issue. Could someone explain how to fix this? This is from some obscure piece of C++ code I'm maintaining and I know only a limited amount of C++.

回答1:

Pass** passes = new Pass*[10];

回答2:

I think this will do it:

typedef Pass * PassPtr;
Pass **passes = new PassPtr[10];

回答3:

I don't understand why you are trying to wrap it so much.

Pass** passes = new Pass*[10];

Does that not work?

回答4:

The extraneous parentheses you are using is now making it seem to the compiler like you are passing a constructor of Pass a lambda as a parameter. Lambdas are a new addition in C++0x, which would be why this error only cropped up in the new compiler. You can fix it by using Pass** passes = new Pass*[10]; instead.

来源：https://stackoverflow.com/questions/4925647/c-array-creation-problem-specific-to-gcc-4-5