CODEWITHSUNDEEP
c++macrosc++11conditional-compilation
pmr
pmr

Reputation: 59841

Checking for availability of C++0x algorithm additions

I'm trying to figure out which of the additions to the algorithm headers are supported by a given implementation (gcc and MSVC would be enough).

The simple way would be to do it the same way as one would do it for core features: check the compiler version and define a macro if a language feature is supported. Unfortunately I cannot find a list that shows the version numbers for either compiler.

Is simply checking for a generic C++0x macro (GXX_EXPERIMENTAL or __cplusplus) enough or should I check the change lists for the compilers and build my macros based on those lists?

http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.200x

Upvotes: 3

Views: 602

Answers (2)

pmr
pmr

Reputation: 59841

As far as I could figure out the only proper solution is to have a build script that tries to compile and run a file that uses the feature and has a runtime assertion. Depending on the outcome have a #define CONFIG_NO_FEATURENAME or similiar in a config file and guard your uses and workaround with a #ifndef.

This way it is possible to check if

  1. the feature is available
  2. the feature functions properly (depending on the correctness of the assertion)

Upvotes: 0

rubenvb
rubenvb

Reputation: 76795

Since all compiler vendors provide a nice list of what's available in what version, and you would test the functionality anyways, I would use compiler versions to check for specific features. Or demand the user uses at least a good version, and not worry about it.

__cplusplus is not necessarily a C++0x macro, it tells you nothing. GXX_EXPERIMENTAL has existed since GCC 4.3, so that's pretty useless too.

Here you can find what macros to check against for a specific version of a compiler.

Upvotes: 2

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