CODEWITHSUNDEEP
c++gccc++11
user34537
user34537

Reputation:

remove_pointer + typename is error

I'm not sure why I am getting an error on this line.

I am compiling with

$CPP -g -std=c++0x -Wall

Where $CPP is g++-4.7. I am including type_traits (C++11, not boost). Is this not supported yet in 4.7.2?

typedef typename remove_pointer<typename T>::type &U;

Error

file.h:222:44: error: template argument 1 is invalid
file.h:222:19: error: expected nested-name-specifier
file.h:222:47: error: typedef name may not be a nested-name-specifier
file.h:222:47: error: expected ‘;’ at end of member declaration
file.h:222:53: error: ISO C++ forbids declaration of ‘U’ with no type [-fpermissive]

Upvotes: 0

Views: 295

Answers (1)

ecatmur
ecatmur

Reputation: 157374

The typename in typename T is incorrect; typename is only to be used on dependent names. Write:

typedef typename remove_pointer<T>::type &U;

Upvotes: 3

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