Recent questions tagged C++

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c++ - Is it possible to infer template parameters of tuple from brace-type initialization?

In this example, is it possible to allow the deduction of the template parameters type of the tuple? ... for heterogeneous initializer lists. 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++ - Decorator for a class method

Supposing I have a function (a decorator) that measures the duration of given function: #include <unistd.h> void ... C++ 1998/2003 Standard. 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++ - How to remove the const from 'char const*'

It appears that std::remove_const isn't able to remove the const-ness of const char*. Consider the following code: ... char const* to char*? 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++ - Getting the size of a Qt Object

I'm using Qt and C++, I need to find out the amount of memory used by instances of certain Qt classes, ... you have any ideas to solve this? 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++ - How does one store a vector<bool> or a bitset into a file, but bit-wise?

How to write bitset data to a file? The first answer doesn't answer the question correctly, since it takes 8 ... a lot of true/false values. 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++ - Simultaneous execution of both if and else blocks

In C or C++ if ( x ) statement1; else statement2; For what value of x will both statements be executed ... . Asking because someone is arguing!) 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++ - Isn't return value optimization (RVO) a bug?

I maybe asking a dumb question, but I looked at the wikipedia page for RVO here and could not stop ... compiler or linker errors right? 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++ - Blocking socket returns EAGAIN

One of my projects on Linux uses blocking sockets. Things happen very serially so non-blocking would just ... when this function completes. 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++ - How to enable Eclipse to autobuild/autosave changes before run (CDT)

I'm trying to conveniently have the updated code in effect when I click the run button in Eclipse. At present ... made) before running the code? 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 ofstream thread safe?

I am working on a program, which uses multiple std::ifstreams for reading a binary file, one std::ifstream for ... Is std::ofstream thread 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++ - WARNING: .../Android.mk: non-system libraries in linker flags

I'm getting this warning while running $ANDROID_NDK_ROOT/ndk-build. The Android.mk is below. $ $ANDROID_NDK_ROOT/ndk ... _M_throw_failure()' ... 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++ - Inlining Template Specialization

If I have a header foo.h which I include all over my project, it seems to work fine when all it ... violate ODR, why does a specialization? 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++ - Win32 files locked for reading: how to find out who's locking them

In C++ (specifically on Visual C++), sometimes you cannot open a file because another executable has it opened ... out who's locking the file? 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++ - No Matching Function Call to Base class

Here I am trying to make a subclass of the base class, Airplane. In my main code I haven't tried to use ... = seats; numEngines = engines; } 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 are there different TEXT like macros for the same thing in win32?

I want to know the reason why there are macros such as T, TEXT, _TEXT, __TEXT or __T when they all ... a separate question for that. 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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c++ - operator new inside namespace

namespace X { void* operator new (size_t); } gives error message as: error: void* X::operator new(size_t)' may ... gcc but not for the new one. 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++ - CRTP -- accessing incomplete type members

Related questions: one, two After trying to understand CRTP for several days it seems that now I ... Any clarification is 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++ - Cuda Hello World printf not working even with -arch=sm_20

I didn't think I was a complete newbie with Cuda, but apparently I am. I recently upgraded my cuda device ... from the rooftops with an answer. 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++ - How to read a float from binary file in C?

Everything I'm finding via google is garbage... Note that I want the answer in C, however if you supplement your ... 't care how it was stored. 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++ - Can I reuse an rvalue reference parameter to return an rvalue reference?

Consider the following code: struct MyString { // some ctors MyString& operator+=( const MyString& other ); / ... an rvalue from operators? 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++ macros with memory?

Is it possible to define macros write_foo(A); and read_foo(); so that: WRITE_FOO(hello); code_block_1; ... code_block_4; world; ? 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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c++ - Variable Length Arrays in C++14?

n3639 proposed the adoption of c99's variable-length-arrays into C++14 (at least for the first ... stacked-crooked.com/a/303ae1970fa3f5d2 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++ - How to call erase with a reverse iterator using a for loop

Regarding the answer provided here: How to call erase with a reverse iterator The following results in a segmentation fault ... it).base() ); } 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 use the Global Offset Table for symbols defined in the shared library itself?

Consider the following simple shared library source code: library.cpp: static int global = 10; int foo() { return ... due to a lack of details. 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++ - FILE * and istream: connect the two?

Suppose I "popen" an executable, I get a FILE* in return. Furthermore, suppose I'd like to "connect" this file to ... is there a way to do this? 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++ - Comparing std::function<>

Is it possible to somehow compare two std::tr1::function<> objects? What if I have a collection of function ... removed seems to be impossible. 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++ - Detect compiler with #ifdef

I'm trying to build a small code that works across multiple platforms and compilers. I use assertions, most ... describing these macros in PGI. 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++ - Bazel & automatically generated cpp / hpp files

I am starting to use Bazel as my C++ project build system. However I am stuck with the ... , experimental_objc_library or cc_proto_library). See Question&Answers more detail:os...

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

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