COMPILE_ASSERT problem

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Compile using MSVC 2010


What is the expected output? What do you see instead?

Compilation should succeed.

What version of the product are you using? On what operating system?

Windows 7 + MSVC 2010 (SP1)

Please provide any additional information below.

Compile error:

btree.h(1401) : error C2064: term does not evaluate to a function taking 2 
arguments

That is the 

COMPILE_ASSERT(
      sizeof(key_compare_checker(key_compare_helper()(key_type(), key_type()))) ==
      sizeof(big_),
      key_comparison_function_must_return_bool);

Original issue reported on code.google.com by [email protected] on 4 Feb 2013 at 2:18