C ++ 11功能的可用性 [英] Availability of C++11 features

问题描述

编译器供应商一直采用C ++ 11特性，这是可预测的，因为它们中的许多不容易实现。

Compiler vendors have been adopting C++11 features piecemeal, which was predictable, as many of them are not easily implemented.

编译器完全支持的规范的标准方式是通过 __ cplusplus 预定义宏。然而，主要供应商报告 __ cplusplus = 199711L，意味着他们只完全支持C ++ 98（例如MSVC14）。这个（可能）意味着他们不完全支持C ++ 11规范，即使他们可能已经实现了大部分的功能。

The standard way for reporting which spec the compiler fully supports is via the __cplusplus predefined macro. However, major vendors are reporting __cplusplus = 199711L, meaning they are only fully supporting C++98 (eg. MSVC14). This (presumably) means that they do not fully support the C++11 spec, even though they may have implemented a lion's share of the functionality.

我想开始使用C ++ 11的功能，当它们可用（和回退到现有的代码，当他们不是）。但是，我的代码必须支持许多编译器，包括我可能无法使用的专有编译器。有没有什么标准的方法来知道哪些C ++ 11功能可以从编译器，而不知道具体使用哪个编译器？ （如果编译器以非标准方式运行，那么检测行为是不正确的）。

I would like to start using C++11 features, when they are available (and fallback to existing code when they are not). However, my code must support many compilers, including proprietary compilers which I may not have access to use. Is there any standard way to know which C++11 features are available from a compiler, without knowing specifically which compiler is being used? (if a compiler behaves in a non-standard way, then it is acceptable for the detection behavior to be incorrect).

注意：这个问题是我的问题的一个概括' static_assert c ++ 11 的可用性，这是不是很受欢迎，因为

NOTE: This question is a generalization of my question 'Availability of static_assert c++11', which was not very well received, because I think my motivation was misunderstood.

推荐答案

您可能对 功能测试宏 ，可让您测试对于特定的C ++ 11，C ++ 14或甚至C ++ 17特性，例如 __ cpp_static_assert ， __ cpp_lib_make_unique 或 __ cpp_variable_templates 。 Clang和GCC已支持此功能，请参阅 现场演示 。

You might be interested in feature test macros, which enable you to test for specific C++11, C++14 or even C++17 features, such as __cpp_static_assert, __cpp_lib_make_unique or __cpp_variable_templates. Clang and GCC already support this, see a live demo.

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