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CPP-11 QUESTIONS

C++ - no match for ‘operator<’
C++ - no match for ‘operator<’
Hope this helps The problem is that std::map will attempt to index the mapped elements, and it doesn't know how to index my_msgs::Nodelet because it doesn't know how to compare this object.You have to provide a third parameter when declaring this map
TAG : cpp-11
Date : November 07 2020, 07:01 PM , By : Leul W.
How does C++ store variables captured by a lambda that have gone out of scope?
How does C++ store variables captured by a lambda that have gone out of scope?
I think the issue was by ths following , The [f, cache] captures the vars by value. Once captured by value, the life of the captured var should be same as the lambda itself.EDIT: If captured by reference (e.g. [f, cache]), the life of cache and the l
TAG : cpp-11
Date : October 13 2020, 07:00 PM , By : Kichul Choi
Why does compiler complaint about the path which can be statically ruled out (see code below)?
Why does compiler complaint about the path which can be statically ruled out (see code below)?
With these it helps Dead code elimination is an optimisation, not a language feature. In C++17 we get if constexpr which does what you want this to. As you have tagged C++11, I will assume you can't use that, and the sensible options are specialising
TAG : cpp-11
Date : October 12 2020, 12:00 PM , By : Litan Das
What is "WriteCallback" in C++ for Arduino?
What is "WriteCallback" in C++ for Arduino?
around this issue typedef void (*WriteCallback) (const byte what); defines a function pointer type which takes a const byte and returns a void. It is used to easily use function pointers. Just as uint8_t is defined using a typedef as: typedef unsigne
TAG : cpp-11
Date : October 11 2020, 02:00 PM , By : frach
the return of function "if constexpr" and "else if constexpr"
the return of function "if constexpr" and "else if constexpr"
it helps some times what's the real code compiler for process() is generated after we call above code in main function.
TAG : cpp-11
Date : October 11 2020, 04:00 AM , By : Evgeny IceIT
How to check filename and variable name are same
How to check filename and variable name are same
I wish this help you The C function for comparing strings is strcmp():
TAG : cpp-11
Date : October 10 2020, 06:00 AM , By : Eduardo Pereira
How to use placeholders in std::bind
How to use placeholders in std::bind
I wish did fix the issue. You have it backwards. The _K placeholder defines the mapping from the Kth argument passed to the generated functor (the result of bind) to the position of the placeholder in the parameters of the bound function. So putting
TAG : cpp-11
Date : October 09 2020, 06:00 AM , By : XRk
Why is my search function not working as expected and how do I fix it?
Why is my search function not working as expected and how do I fix it?
it fixes the issue Probably the main problem is that you are trying to access name[k-1] and lastname[k-1], when k=0, which results in UB.Before continuing with your work, start learning the STL algorithms. With that in mind, your task becomes trivial
TAG : cpp-11
Date : October 09 2020, 12:00 AM , By : Eyal
boost::asio::strand fails to make async_write thread safe
boost::asio::strand fails to make async_write thread safe
wish of those help onTimer runs on a separate thread, and invokes SendToClient (without synchronization):
TAG : cpp-11
Date : October 08 2020, 01:00 PM , By : Ulises Mzr
compile error when a template function call a template static function in a template class
compile error when a template function call a template static function in a template class
will be helpful for those in need A compile error when I write template in c++, hard to understand for me. This is the code , You need to put template
TAG : cpp-11
Date : October 04 2020, 05:00 AM , By : mohamed ramadaan
C++11 memory ordering support in GCC
C++11 memory ordering support in GCC
hope this fix your issue If you are interested in performance, then looking at non-optimised machine code is not going to get you anywhere. Here's what gcc -O2 generates:
TAG : cpp-11
Date : October 03 2020, 02:00 PM , By : dywan666
How do I make this function tail recursive?
How do I make this function tail recursive?
To fix this issue Taking this question on it's face value.In the current form, the code is not suitable for TCO, due to the fact that vector desiredCodes is passed by value. It requires caller to destruct the local vector after recursive call, so tai
TAG : cpp-11
Date : October 02 2020, 09:00 PM , By : melkycel
Function in template class vs template function
Function in template class vs template function
this one helps. When we have a function template like this: , In:
TAG : cpp-11
Date : October 02 2020, 06:00 AM , By : Avto Achelashvili
Which one is more efficient the method std::basic_string::append or the operator '+'?
Which one is more efficient the method std::basic_string::append or the operator '+'?
I wish did fix the issue. Both operator+ and std::basic_string::append have overloads that avoid unnecessary copies of string literals - w.r.t. to unnecessary temporaries/copies you won't see any runtime performance difference.Besides, these two opti
TAG : cpp-11
Date : October 01 2020, 03:00 AM , By : Racer
C++ type deduction with chain of auto declaration
C++ type deduction with chain of auto declaration
I wish this helpful for you I found a way to determine those variables types and their qualifier (const or ):from this post Is it possible to print a variable39;s type in standard C++?
TAG : cpp-11
Date : September 30 2020, 05:00 PM , By : B.hughes
May I call destructor from move assignement operator?
May I call destructor from move assignement operator?
may help you . You could, in principle, call a destructor this way, if you then use placement new to construct the object back into the now-empty space. Something like this:
TAG : cpp-11
Date : September 22 2020, 08:00 AM , By : Robin Fahy
reference to std::shared:ptr to avoid reference counting
reference to std::shared:ptr to avoid reference counting
like below fixes the issue Yes, there will necessarily be a reference count increment prior to entry to foo2 and a decrement on exit. This is because the parameter const std::shared_ptr p must refer to a distinct object of type std::shared_ptr, so a
TAG : cpp-11
Date : September 07 2020, 11:00 AM , By : Gesha Akbar
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