C2977: 'std::tuple' : too many template ar

Question

I'm trying to build googletest with Visual C++ 11, but following code causes an error

template <typename T1, typename T2, typename T3, typename T4, typename T5,
          typename T6, typename T7, typename T8, typename T9>
void PrintTo(const ::std::tr1::tuple<T1, T2, T3, T4, T5, T6, T7, T8, T9>& t, // <-- error C2977
             ::std::ostream* os) {
  PrintTupleTo(t, os);
}

That's an error text:

f:\gtest-1.6.0\include\gtest\gtest-printers.h(550): error C2977: 'std::tuple' : too many template arguments
  c:\program files (x86)\microsoft visual studio 11.0\vc\include\utility(72) : see declaration of 'std::tuple'

And there is the line 72 of utility-file:

template<class = _Nil, _MAX_CLASS_LIST>
   class tuple; // Line 72

What is the problem with std::tuple and how to fix it?

(BTW: I'm tried unsuccessfully to change std::tr1::tuple to std::tuple )

Answer 1

In Visual Studio 2013, std::tuple no longer uses _VARIADIC_MAX and now uses actual variardic templates, so this problem should be gone.

If you run into it in 2013, it means you are including the wrong standard library.

Answer 2

This is fixed in version r675. See https://code.google.com/p/googletest/source/detail?r=675

Answer 3

Add below line into your cmake file

add_definitions(/D_VARIADIC_MAX=10)

Answer 4

Setting GTEST_HAS_TR1_TUPLE to 0 in gtest.h helped in my case

Update: of course, the less intrusive way is to define a precompiler flag GTEST_HAS_TR1_TUPLE=0. Check the answers about _VARIADIC_MAX=10 - solves another half of the issue.

Answer 5

In Visual Studio 2012 (VC11) _VARIADIC_MAX is by default defined as 5 in header <xstddef>:

#if !defined(_VARIADIC_MAX)
 #define _VARIADIC_MAX  5

#elif _VARIADIC_MAX < 5 || 10 < _VARIADIC_MAX
 #error _VARIADIC_MAX must be between 5 and 10, inclusive
#endif /* !defined(_VARIADIC_MAX) */

if you have multiple VC11 projects include <tuple> in a solution, it is better to set the macro to all by

1) Shift click to select all C++ projects in your solution

2) Properties, C/C++, Preprocessor, All Configurations All Platforms, Preprocessor Definitions, <Edit>

3) add before <different options> a row

_VARIADIC_MAX=10;

You can change 10 to any number in 6~10.

Answer 6

Check out this entry in the msdn blog. VC++11 doesn't have support for variadic templates. They have something they call faux variadics. Scroll down and you will see a paragraph on Faux variadics that talks about tuples. On that paragraph they say the default maximum number of parameters is 5. You can increase it to 10:

You can define _VARIADIC_MAX project-wide between 5 and 10 inclusive (it defaults to 5). Increasing it will make the compiler consume more memory, and may require you to use the /Zm option to reserve more space for PCHes.

They say they have a fix incoming to make the default 10 again.