Make range_value SFINAE-friendly

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#89 opened on Mar 22, 2019 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 35/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: cpp
Domain: compilers

Research direction

Start at range_value and inspect how it unconditionally uses range_iterator::type. Compare the behavior for range and non-range types, then locate the existing range trait tests to add coverage for the requested SFINAE behavior. Done means non-range T no longer causes a hard compilation failure and does not define type.

Written by the indexing model from the issue text.

Description

Currently (Boost 1.69) range_value<T>::type hard-fails to compile if T is not a range type. This is because it unconditionally uses range_iterator<T>::type and that type is missing in that case. Please, make range_value also SFINAE-friendly, i.e. so that it doesn't hard-fail the compilation but rather doesn't define the type type if T is not a range type.

Dominant language: C++
Stars: 45
Forks: 104
PR merge metrics: No merged PRs in 30d

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