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elision    
n. 元音省略

母音省略

elision
n 1: omission of a sound between two words (usually a vowel and
the end of one word or the beginning of the next)
2: a deliberate act of omission; "with the exception of the
children, everyone was told the news" [synonym: {exception},
{exclusion}, {elision}]


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  • c++ - How to enforce copy elision in C++20? - Stack Overflow
    Technically, guaranteed copy elision is not even considered copy elision anymore, it is simply a change in the specification of prvalues "Guaranteed copy elision" happens when initializing an object (including in a return statement) with a prvalue of the same class type (ignoring cv-qualification)
  • What are copy elision and return value optimization?
    Copy elision is an optimization implemented by most compilers to prevent extra (potentially expensive) copies in certain situations It makes returning by value or pass-by-value feasible in practice (restrictions apply)
  • Move constructor called with copy elision? - Stack Overflow
    1 added "guaranteed elision" With guaranteed elision, prvalues are not materialized until needed When used to construct an object, they directly construct the object In , prvalues are temporary objects, and in certain circumstances the move construction is permitted to be skipped and you can merge to objects into one lifetime The difference
  • Is copy elision in the form of named return value optimization . . .
    The fact that this optimization was performed on a C program changes the observable behavior of the program in violation of the C standard Specifically, t and s are distinct objects whose lifetime overlaps and as such they must have different addresses So this is a bug in clang that copy elision is being applied to a C program
  • c++ - Move constructor vs Copy elision - Stack Overflow
    That code block is an example of where copy elision is mandatory, so the compiler isn't even allowed to use the move constructor there The first code block shows examples of where copy elision won't happpen
  • Return value optimization or move in C++11 - Stack Overflow
    Even when copy elision is disabled (-fno-elide-constructors) the move constructor gets called @Maggyero: -fno-elide-constructors doesn't disable copy elision, it disables return value optimisation The former is a language rule that you cannot "disable"; the latter is an optimisation that takes advantage of this rule
  • c++ - Copy elision for pass-by-value arguments - Stack Overflow
    Copy elision is the only allowed form of optimization that can change the observable side-effects Consequently, due to the fact that some compilers do not perform copy elision in every situation where it is allowed (e g , in debug mode), programs that rely on the side-effects of copy move constructors and destructors are not portable
  • c++ - polymorphic unique_ptr copy elision - Stack Overflow
    Is the return value technically being move-constructed in this case, due to copy elision? And if so, does that mean unique_ptr 's move constructor is designed to support implicit upcasts of user class types?





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