c++ - List Questions - Page 2

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C++ - How to override a template function in Subclass?

You may want to look into the CRTP pattern for this, if I understand your intent correctly. Also, your outline has no way to properly free dynamic memory, you better derive BaseV from a common interfa...

Tags: c++, templates, inheritance

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how to define in C++20 a concept to check if a type matches any of the types in a type-list?

how to define in C++20 a concept to check if a type matches any of the types in a type-list Method 1 You can change the program to as shown below. This is more readable than method 2. template struc...

Tags: c++, variadic-templates, template-meta-programming

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C++ - error: cannot convert istd::optional<int>' to 'const int' in initialization?

Function ranges::fold_left_first returns std::optional rather then int: https://en.cppreference.com/w/cpp/algorithm/ranges/fold_left_first Here's the corrected code: #include #include #include #i...

Tags: c++, fold, std-ranges

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Why have to write '-lstdc++' every time at the end when I compile C/C++ code in my MacBook Air M2?

When you compile C++ code on a MacBook, especially on one with the M1 or M2 chip which uses the ARM64 architecture, using gcc directly sometimes doesn't automatically link against the C++ standard lib...

Tags: c++, compiler-construction, clang

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C++ - How to decide on type in template argument (i.e. ternary operator at compile time)?

The idiomatic solution is using std::conditional: template class A { B var; };

Tags: c++, conditional-operator, class-template

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C++ - Added a base struct breaks overloading?

If you define a function in a derived class it completely hides any function in the base class with the same name in the derived class's namespace. That means that the add member function in your Lexe...

Tags: c++, inheritance, struct

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C++ - Result suddenly wrong when running program on a big number of threads; threads getting called after WaitForMultipleObjects ends?

WaitForMultipleObjects can only wait on a maximum of MAXIMUM_WAIT_OBJECTS (which is 64) handles. As soon as you try to wait on more handles which is the case in your code, the wait fails and therefore...

Tags: c++, multithreading, winapi

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C++ - I want to know why the error occurred in the following code. Is it related to the type conversion operator？?

Because of how template argument deduction is specified (see: https://en.cppreference.com/w/cpp/language/template_argument_deduction#Conversion_function_template, Implications of conversion function t...

Tags: c++, c++17, clang++

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C++ - Answer is wrong when i include sort() function (Rudolf and the ticket from codeforces)?

sort(begin(A), end(A)); sorts the all 1000 elements of the array int A[1000];. This includes uninitialized elements, so the sorting may put garbage values to what is processed and may lead to wrong ou...

Tags: c++

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C++ - Can I have a compile time bound check for std::array in the index is known to the compiler and normal behaviour otherwise?

You won't get a compile time check for your runtime value. You can get Compiletime checks for your constexpr values Runtime checks for runtime values Example: template class A { private: std::a...

Tags: c++, arrays

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