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Questions - temporary-objects

How to elide type of temporary object in a variadic function call?

When is it possible to elide types of temporaries passed into a variadic function template? Overload resolution doesn't seem to work. Consider this: #include <vector> struct option { std::v...
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glades

c++11

variadic-functions

template-argument-deduction

temporary-objects

Votes: 0

Answers: 0

Dangling reference solution

T&& operator[](std::size_t n) && noexcept {std::cout<<"move"<<std::endl; return std::move(vec[n]); } I cannot get the expected result in this part. I predict a da...
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gahhu

c++

reference

lifetime

temporary-objects

dangling-pointer

Votes: 0

Answers: 1

Latest Answer

For auto&& vec = my_vector<int>{1, 2, 3}[0];, the reference isn't bound to the temporary (i.e. my_vector<int>{1, 2, 3}) directly, its lifetime won't be extended. In general, the l...
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songyuanyao

Temporary materialization and xvalue expression

cppreference is said that: any expression that designates a temporary object after temporary materialization is xvalue expression (since C++17). Temporary materialization is: A prvalue of any complet...
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user15676138

c++

temporary-objects

xvalue

Votes: 0

Answers: 2

Latest Answer

When the compiler converts const T& t = T(); into the AST, it looks roughly like this: `-DeclarationStatement `-VariableDeclaration (name: t, type: const T&) `-InitializerExpr (type: con...
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Cubbi

Can dereferencing a non-temporary iterator create a temporary?

With the following code: typedef const int * const & RefType; typedef std::vector<int *>::const_iterator IterType; RefType reffunc (const IterType & it) { return *it; } I find that g++...
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roystgnr

c++

temporary-objects

const-iterator

Votes: 0

Answers: 0

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