Remove dead guards from container_traits.hpp

[samkelemen]

Before filing

• I searched the existing issues and did not find a duplicate.
• This is a concrete proposal, not an open-ended design question.

Kind of addition

• New algorithm
• New data structure
• New property map or utility
• New I/O format reader or writer
• Extension to an existing component
• Performance improvement
• Other (specify below)
  Remove BOOST_CXX11* guards from include/boost/pending/container_traits.hpp

Motivation

There are many guards in the codebase left from before the library required C++14. The motivation is to clean up this one file of the code base to no longer have these dead guards.

Proposed addition

The following guards will be removed from container_traits.hpp:

• #ifndef BOOST_NO_CXX11_HDR_UNORDERED_SET
• #ifndef BOOST_NO_CXX11_HDR_UNORDERED_MAP
• #ifdef BOOST_NO_CXX11_RVALUE_REFERENCES

Relation to existing Boost.Graph components

This change has no impact on the code, as the guards are dead code with C++14 or greater.

Prior art

• Reference paper or textbook (cite below)
• Implementation in another library (link below)
• None / original idea

References:

Are you willing to contribute?

• I'd like to submit the implementation as a pull request.
• I can help with review or testing, but not the implementation.
• I'm only proposing the idea.