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c++11 Return value optimization or move? [duplicate]
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GCC documentation on -fno-elide-constructors: "The C++ standard allows an implementation to omit creating a temporary that is only used to initialize another object of the same type. Specifying this option disables that optimization, and forces G++ to call the copy constructo...
Determining 32 vs 64 bit in C++
I'm looking for a way to reliably determine whether C++ code is being compiled in 32 vs 64 bit. We've come up with what we think is a reasonable solution using macros, but was curious to know if people could think of cases where this might fail or if there is a better way to do this. Please note we ...
What does “dereferencing” a pointer mean?
...rested in the pointed-to object's (current) value - I focus below on C and C++.
A pointer scenario
Consider in C, given a pointer such as p below...
const char* p = "abc";
...four bytes with the numerical values used to encode the letters 'a', 'b', 'c', and a 0 byte to denote the end of the tex...
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...风格以及结构、并展示主要功能模块以及之间相互关系，不断确认模糊部分，为后期的视觉设计和代码编写提供准确的产品信息。
目的：
下列角色使用用户界面原型：
用例阐释者，用来了解用例的用户界面；
系统分析员，...
Checking if a folder exists (and creating folders) in Qt, C++
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Not the answer you're looking for? Browse other questions tagged c++ qt filesystems or ask your own question.
C++: Rounding up to the nearest multiple of a number
...s? What about negative numbers? The behaviour seems to be undefined in pre-C++11.
– cubuspl42
Aug 18 '15 at 16:28
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Why sizeof int is wrong, while sizeof(int) is right?
...ty of sizeof (int *) + 1. It is (sizeof(int*))+1, not sizeof((int*)(+1)).
C++ has a somewhat similar issue to resolve with function-style cast syntax. You can write int(0) and you can write typedef int *intptr; intptr(0);, but you can't write int*(0). In that case, the resolution is that the "naked...
How to concatenate two strings in C++?
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Since it's C++ why not to use std::string instead of char*?
Concatenation will be trivial:
std::string str = "abc";
str += "another";
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How do you make a web application in Clojure? [closed]
...uld look like:
(def app [req]
(if (= "/home" (:uri req))
{:status 200
:body "<h3>Welcome Home</h3>"}
{:status 200
:body "<a href='/home'>Go Home!</a>"}))
One other part of Ring is the concept of middle-ware. This is code that sits between the handler...
How to remove all the occurrences of a char in c++ string
I am using following:
10 Answers
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