C++命名空间与gtest和boost的冲突

Question

如果我同时包含 gtest/gtest.h 和 boost/math/distributions/poisson.hpp，我会得到：

/opt/local/include/boost/tr1/tuple.hpp:63: error: ‘tuple’ is already declared in this scope
/opt/local/include/boost/tr1/tuple.hpp:67: error: ‘make_tuple’ is already declared in this scope
/opt/local/include/boost/tr1/tuple.hpp:68: error: ‘tie’ is already declared in this scope
/opt/local/include/boost/tr1/tuple.hpp:68: error: ‘tie’ is already declared in this scope
/opt/local/include/boost/tr1/tuple.hpp:68: error: ‘tie’ is already declared in this scope
/opt/local/include/boost/tr1/tuple.hpp:68: error: ‘tie’ is already declared in this scope
/opt/local/include/boost/tr1/tuple.hpp:68: error: ‘tie’ is already declared in this scope
/opt/local/include/boost/tr1/tuple.hpp:68: error: ‘tie’ is already declared in this scope
/opt/local/include/boost/tr1/tuple.hpp:68: error: ‘tie’ is already declared in this scope
/opt/local/include/boost/tr1/tuple.hpp:68: error: ‘tie’ is already declared in this scope
/opt/local/include/boost/tr1/tuple.hpp:68: error: ‘tie’ is already declared in this scope
/opt/local/include/boost/tr1/tuple.hpp:68: error: ‘tie’ is already declared in this scope
/opt/local/include/boost/tr1/tuple.hpp:72: error: ‘tuple_size’ is already declared in this scope
/opt/local/include/boost/tr1/tuple.hpp:73: error: ‘tuple_element’ is already declared in this scope

我该如何防止这两个库命名空间冲突？

- bias

Answer 1

尝试定义BOOST_HAS_TR1_TUPLE并进行构建。看起来boost和您的std库都定义了std::tr1::tuple，我不知道如何禁用std版本。然而，查看boost头文件，似乎需要定义BOOST_HAS_TR1_TUPLE来告诉boost已经定义了std::tr1::tuple。

当我尝试编译包含这两个头文件的文件时，出现了与您类似的错误，但当我定义了BOOST_HAS_TR1_TUPLE后，这些错误就消失了。

- Troubadour

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这取决于编译器版本和gtest版本。除非编译器为gcc 4+，否则GTest还会定义自己的元组。因此，在这种情况下，boost将使用gtest的实现，您可能不想要这样。但是您也可以通过将GTEST_USE_OWN_TR1_TUPLE设置为0，在gtest中使用boost元组。 - housemaister

Answer 2

你尝试过交换包含的顺序吗？可能另一个头文件会更优雅地处理问题。

- Jesse Vogt

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不幸的是，将顺序从gtest/boost更改为boost/gtest会导致混乱。 - bias

Answer 3

在我的情况下，通过在gtest.h中将GTEST_HAS_TR1_TUPLE设置为0有所帮助。

- Dmitry Ledentsov

Answer 4

为了在Microsoft Visual Studio 2010中包含boost/math/distributions/fisher_f.hpp，我需要定义BOOST_NO_0X_HDR_TUPLE以及BOOST_HAS_TR1_TUPLE。

- Lex