Recent questions tagged C++

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c++ - Does sizeof evaluate at compile-time or runtime?

I am confused about the evaluation time of sizeof operator. When does the sizeof operator get evaluated? Does its ... at runtime in C++? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Visual Studio Character Sets 'Not set' vs 'Multi byte character set'

I've working with a legacy application and I'm trying to work out the difference between applications compiled ... Multi byte character set. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - xutility(2227): warning C4996: 'std::_Copy_impl'

I got this warning message.. but i dont know what/where the problem is..! includes #pragma warning(push) #pragma ... (pop) anybody got any idea? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why does explicitly calling operator<< on std::cout cause unexpected output?

I was simply curious about what would happen if I called operator<< on std::cout explicitly because I ... ? Any responses are appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Visual Studio TODO / Task List not showing up

Using Visual Studio 2010 Express I have a task list open and on filter setting comments. It does not show ... the tokens manually or something? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - typeid(complex<double>(0.0,1.0)) != typeid(1.0i)

Using gcc 4.9 I found that types generated with type literal for complex numbers are not the same as when ... I am overlooking something...) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - iterator validity ,after erase() call in std::set

Do erase call in std::set invalidate iterator ? As i have done below 5th from last line..? if yes what is ... it invalidate Iterator ? } } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Passing array with unknown size to function

Let's say I have a function called MyFunction(int myArray[][]) that does some array manipulations. If I ... to do the conversion manually? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Constant enum size no matter the number of enumerated values

Why is the size of an enum always 2 or 4 bytes (on a 16- or 32-bit architecture respectively), regardless of ... an enum like it does a union? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ cli - c++/cli caret^ Vs. Pointer*?

I've programming for a long time in C and in C#, I thought moving to C++ would be smooth... anyway, I' ... st1; to String::string ^st2; Thanks! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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671 views

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c++ - getline while reading a file vs reading whole file and then splitting based on newline character

I want to process each line of a file on a hard-disk now. Is it better to load a file as a whole and ... whole file and gives line by line? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What's the low-level difference between a pointer an a reference?

If we have this code: int foo=100; int& reference = foo; int* pointer = &reference; There's no actual binary ... int* pointer=&foo; *pointer=5; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - There is no strsafe.h in MinGW? What to use instead?

Compiling first snippet from here : http://msdn.microsoft.com/en-us/library/ms682499(VS.85).aspx gives ... or directory compilation terminated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Using std::mutex, std::condition_variable and std::unique_lock

I'm having some trouble understanding condition variables and their use with mutexes, I hope the community can ... references on this subject. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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409 views

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c++ - How do I disable tailcall optimizations in gcc

Wondering if anyone knows the flag for gcc to disable tailcall optimizations. Basically in a tailcall optimization, gcc ... Thanks in advance! P See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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217 views

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c++ - If MessageBox()/related are synchronous, why doesn't my message loop freeze?

Why is it that if I call a seemingly synchronous Windows function like MessageBox() inside of my message loop ... guess) Thanks in advance See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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298 views

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c++ - Function template specialization

While reading this, I'm confused by the following examples: // Example 2: Explicit specialization // template< ... ordering of the declaration? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Lib and DLL linking to an exe error "cannot read at 0x300"

I have a general question about how .dll/.libs are suppose to be used. I am creating a .dll to be used for ... , then why bother using .dll's? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Template class member specialization without declaration in header

I have a template class that I declare in a header with one method and no definition of that method in ... don't declare the specializations.) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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386 views

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c++ - sizeof variadic template (sum of sizeof of all elements)

Considering the following function : template<typename... List> inline unsigned int myFunction(const List&... list) { return / ... = 4+1+8 = 13 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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248 views

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c++ - Repeated use of a variadic function argument doesn't work

I have a function that tries to log stuff to the console and also to a log file, but it doesn't work. The second ... (fmt, ap2); va_end(ap2); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - cast const Class using dynamic_cast

I want to cast this: class Base { public: virtual ~Base(){}; }; class Der : public Base {}; int main( ... the const but this doesn't work. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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209 views

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c++ - Can a move constructor be implicit?

Consider the following class: class A { public: std::string field_a; std::string field_b; } Now consider the ... rules you're looking at. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Is it safe to cast a lambda function to a function pointer?

I have this code: void foo(void (*bar)()) { bar(); } int main() { foo([] { int x = 2; ... local variable. Is the first example completely safe? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Using std::less with nullptr

Does the assertion in the following code snippet always hold? std::less<Object *> lessPtr; Object * o = new Object() ... (o, nullptr) == false); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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213 views

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c++ - Determining which overload was selected

Let's say I have some arbitrary complicated overloaded function: template <class T> void foo(T&& ); template < ... curious if it's possible. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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218 views

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c++ - Are older SIMD-versions available when using newer ones?

When I can use SSE3 or AVX, are then older SSE versions as SSE2 or MMX available - or do I still need to check for them separately? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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355 views

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c++ - Alternatives to ppl

In my previous question I've asked, I touched the parallel_for subject from ppl.h provided by Microsoft. But ... (portable) alternatives to ppl? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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