c++11 Archives - Page 6 of 11

“unpacking” a tuple to call a matching function pointer

I’m trying to store in a std::tuple a varying number of values, which will later be used as arguments for a call to ...

May 19, 2022
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Why would I ever use push_back instead of emplace_back?

C++11 vectors have the new function emplace_back. Unlike push_back, which relies on compiler optimizations to avoid copies, emplace_back uses perfect forwarding to send ...

May 19, 2022
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How is “int main(){(([](){})());}” valid C++?

I recently came across the following esoteric piece of code. int main(){(((){})());} Reformat it as follows to make it more readable: int main(){ ...

May 18, 2022
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Error “undefined reference to ‘std::cout'”

Shall this be the example: #include <iostream> using namespace std; int main() { cout << "Hola, moondo.\n"; } It throws the error: gcc ...

May 18, 2022
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Is std::unique_ptr required to know the full definition of T?

I have some code in a header that looks like this: #include <memory> class Thing; class MyClass { std::unique_ptr< Thing > my_thing; }; ...

May 18, 2022
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Is there any use for unique_ptr with array?

std::unique_ptr has support for arrays, for instance: std::unique_ptr<int> p(new int...

May 18, 2022
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Why doesn’t C++ have a garbage collector?

I’m not asking this question because of the merits of garbage collection first of all. My main reason for asking this is that ...

May 18, 2022
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Passing capturing lambda as function pointer

Is it possible to pass a lambda function as a function pointer? If so, I must be doing something incorrectly because I am ...

May 17, 2022
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Difference between angle bracket < > and double quotes ” ” while including header files in C++? [duplicate]

This question already has answers here: Closed 11 years ago. Possible Duplicate: What is the difference between #include <filename> and #include “filename”? What ...

May 17, 2022
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Why does C++11’s lambda require “mutable” keyword for capture-by-value, by default?

Short example: #include <iostream> int main() { int n; [&](){n = 10;}(); // OK [=]() mutable {n = 20;}(); // OK //...

May 17, 2022
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