C2977: 'std:::tuple':模板参数太多(MSVC11)

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

我正在尝试使用Visual c++ 11构建google测试，但是遵循代码会导致错误

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:

这是一个错误的文本:

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:

这是实用文件的第72行:

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

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

std的问题是:tuple和如何修复它?

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

(顺便说一下，我尝试改变std::tr1::tuple::tuple)

7 个解决方案

#1

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:

请查看msdn博客中的这一条目。vc++ 11不支持变量模板。他们有一种叫人造葡萄树的东西。向下滚动，你会看到一段关于人造杂色的文字，它是关于元组的。在那一段中，他们说默认的最大参数数是5。你可以把它增加到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.

您可以在5到10(默认为5)之间定义_variradic_max项目范围，增加它将使编译器消耗更多的内存，并可能要求您使用/Zm选项为PCHes预留更多的空间。

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

他们说，他们有一个修复进入，使默认10再次。

#2

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

在Visual Studio 2012 (VC11) _variradic_max在header 中默认定义为5:

#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

如果您有多个VC11项目包括解决方案中的，那么最好将宏设置为all by

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

1) Shift单击可选择解决方案中的所有c++项目

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

2)属性，C/ c++，预处理器，所有平台配置，预处理器定义， <编辑>

3) add before <different options> a row

3)在 <不同选项> 前添加一行

_VARIADIC_MAX=10;

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

你可以在6~10之间把10换成任意数字。

#3

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

在gtest中将GTEST_HAS_TR1_TUPLE设置为0。h帮助了我的案子。

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.

更新:当然，不那么烦人的方法是定义一个预编译器标记GTEST_HAS_TR1_TUPLE=0。检查关于_variradic_max =10的答案——解决了问题的另外一半。

#4

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

这在r675版本中得到了修正。参见https://code.google.com/p/googletest/source/detail?r=675

#5

Add below line into your cmake file

在cmake文件中添加以下行

add_definitions(/D_VARIADIC_MAX=10)

#6

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

在Visual Studio 2013中，std:::tuple不再使用_variradic_max，现在使用实际的variardic模板，所以这个问题应该已经解决了。

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

如果您在2013年遇到它，这意味着您包含了错误的标准库。

#7

To use GoogleTest in Visual Studio 2012, you should set _VARIADIC_MAX=10 under Properties->C/C++->Preprocessor->PreprocessorDefinitions on the projects that use it. else you might encounter with below error error C2977: 'std::tuple' : too many template arguments

要在Visual Studio 2012中使用GoogleTest，您应该在属性—>C/ c++ ->预处理器—>预处理器—使用它的项目上设置_variradic_max =10。否则，您可能会遇到下面的错误错误C2977: 'std:::tuple':模板参数太多

#1