~/talk

My Temporary Materialization Misconception

on YouTube 05m
Talkat CppCon 2019 · 2019-09-15..09-20· [software-architecture]

speaker

name:Steffan Tjernstrom
links:none on file

resources

video:https://youtu.be/5v8Iyix0kAU
slides:none on file

summary

Sees C++17 elision failing: constructing a vector of unique_ptr<Dispatcher> triggers many unexpected move (and sometimes copy) constructor calls when objects are created with make_unique with perfect forwarding. Reproduces with a non-copyable dispatcher type with complex move semantics, isolates the culprit to temporary materialization that happens on binding a reference to a prvalue, and notes P527 as a possible future fix.

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chapters (6)

  1. 0:00Start
  2. 0:38Temporary Materialization - what it is
  3. 1:15C++17 Value Categories
  4. 3:26Let's go simple
  5. 4:13When does materialization occur?
  6. 4:51Don't do what I did, do as they say

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