Cannot declare a class template with no name

Question

The error:

"cannot declare a class template with no name"

is given by clang++ with the following file, "foo.cpp":

#ifndef foo
#define foo

template <class T>
struct foo {
private:
    const T t;
};

#endif

The command line input and error:

me@computer$ clang++ -c foo.cpp
foo.cpp:5:1: error: cannot declare a class template with no name

Answer 1

Change the include guards. They define foo to be nothing, replacing any further occurrence of foo with nothng. This removes your class template's name.

#ifndef FOO_H_
#define FOO_H_

// as before

#endif