Recent questions tagged C++

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c++ - "static const int" causes linking error (undefined-reference)

I am baffled by the linker error when using the following code: // static_const.cpp -- complete code #include < ... be wrong with my 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 it possible to disallow taking a reference to an object

I want to do the opposite of making instances of a class noncopyable, that is, make sure that instances of a ... a legitimate way of doing 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++ - Why does is_constructible claim something is constructible when it isn't?

The following program, when compiled with either GCC 4.7 and clang 3.2, produces "1" as output. #include ... compilers say it is constructible? 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::string_view with api, what expects null terminated string

I have a method that takes std::string_view and uses function, which takes null terminated string as parameter. For ... types of strings in it. 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++ - Return type of assignment operator

When defining an assignment operator, it invariably looks like this: class X {...}; X& X::operator=(...whatever... ... C++03 (if that matters). 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++ - Default constructor and virtual inheritance

Is possible to have virtual inheritance for class not providing default constructor? The present diamond diagram (the ... }; Thanks, Francesco 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 exec to execute a system command in a new process

I am trying to spawn a process that executes a system command, while my own program still proceeds and two processes will ... "done" << endl; } 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++ - Anonymous Namespace Ambiguity

Consider the following snippet: void Foo() // 1 { } namespace { void Foo() // 2 { } } int main( ... inside an anonymous namespace in this case? 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 convert a dynamic dll to static lib?

I write a program helloworld.exe; it depends on a.dll. I don't have the source code of the a.dll, which ... I can link it into helloworld.exe? 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 cast to a pointer then dereference?

I was going through this example which has a function outputting a hex bit pattern to represent an arbitrary float. ... the same, so confused. 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 disable narrowing conversion warnings?

I use -Wall and updating to new gcc I have got a lot of warning: narrowing conversion. I want to disable ... -Wno-conversion doesn't help. 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++ - Relation between constexpr and pure functions

Am I right, that: Any function defined with constexpr is a pure function, and Any pure function can be ... s functions defined with constexpr ? 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 make a thread-safe std::atomic<vector<int>>?

I'm having a function that needs to be executed n=1000 times. This functions does a Monte Carlo style simulation ... use push_back etc. on it? 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++ - `f(void)` meaning no parameters in C++11 or C?

In C++11 the following function declaration: int f(void); means the same as: int f(); A parameter ... declare a function with no parameters? 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 do you specify a 64 bit unsigned int const 0x8000000000000000 in VS2008?

I read about the Microsoft specific suffix "i64" for integer constants. I want to do an UNsigned shift ... but got compiler errors. 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++ - Set an exe icon for my program

I'm using Microsoft Visual Studio 2008 and I'm trying to set an exe icon for my program. I've searched ... the main icon for my application? See Question&Answers more detail:os...

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

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358 views

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c++ - How to portably find out min(INT_MAX, abs(INT_MIN))?

How can I portably find out the smallest of INT_MAX and abs(INT_MIN)? (That's the mathematical absolute value of ... for a more portable way. 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++ - std::max() and std::min() not constexpr

I just noticed that the new standard defines min(a,b) and max(a,b) without constexpr. Examples from 25.4.7, ... why those can not be constexpr? See Question&Answers more detail:os...

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

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328 views

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c++ - std::unordered_map insert with hint

std::map has an insert method that takes a "hint" iterator that will reduce the insertion time from log(n) ... calling lower_bound on the map. 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++ - boost-sprit-lex unifying multiple tokens into a single token in lex differentiated by the id

edit : I have ripped out the lexer as it does not cleanly integrate with Qi and just obfuscates grammars (see ... t_string [ _val = RBL_STRING]; 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++ - Make recipe to prevent rebuilding of non-dependent targets

I have the following project directory structure: Prog /include /include/dir1 /include/dir2 /src /src/dir1 / ... ://stackoverflow.com/a/2484343 See Question&Answers more detail:os...

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

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354 views

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c++ - Exchange Data Between MPI processes (halo)

Given the following scenario, I have N MPI processes each with an object. when the communication stage comes, data " ... I am not aware of? See Question&Answers more detail:os...

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

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197 views

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c++ - file scope and static floats

I've run into an interesting problem in an AI project of mine. I'm trying to format some debug text ... static variables and file scope? See Question&Answers more detail:os...

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

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395 views

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c++ - How to find the Qt5 CMake module on Windows

I'm trying to make a very basic Qt5 application using CMake on Windows. I used the documentation of Qt5 to use ... ! Do you have any ideas? 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++ - std::remove_if using other class method

I want to use std::remove_if with a predicate that is a member function of a differenct calss. That is class B; ... to BOOST or c++11 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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327 views

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c++ - Boost.Spirit.Qi: dynamically create "difference" parser at parse time

A "difference" parser can be created by the binary -(minus) operator: rule = qi::char_ - qi::lit("}}") or ... couldn't find out how to use it. See Question&Answers more detail:os...

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

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200 views

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c++ - Derived class Private method is getting called

I have a Base class pointer pointing to derived class object. The method foo() is public in base class but private in ... ->foo(); return 0; } See Question&Answers more detail:os...

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

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284 views

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c++ - Using `getline(cin, s);` after using `cin >> n;`

int n; std::cin >> n; std::string s = ""; std::getline(cin, s); I noticed that if I use cin, my ... I want to get a line after using cin? See Question&Answers more detail:os...

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

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