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Why would I make() or new()?
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Go has multiple ways of memory allocation and value initialization:
&T{...}, &someLocalVar, new, make
Allocation can also happen when creating composite literals.
new can be used to allocate values such as integers, &int is illegal:
new(P...
Difference in make_shared and normal shared_ptr in C++
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The difference is that std::make_shared performs one heap-allocation, whereas calling the std::shared_ptr constructor performs two.
Where do the heap-allocations happen?
std::shared_ptr manages two entities:
the control block (stores meta data such as ref-counts, type-erased del...
Why should I use a pointer rather than the object itself?
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It's very unfortunate that you see dynamic allocation so often. That just shows how many bad C++ programmers there are.
In a sense, you have two questions bundled up into one. The first is when should we use dynamic allocation (using new)? The second is when should w...
How do I make a redirect in PHP?
Is it possible to redirect a user to a different page through the use of PHP?
30 Answers
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xtree(1796): warning C4800: “int”: 将值强制为布尔值“true”或“false...
...s<std::string,CPTCensorStatusItem *,CGraphFrame::Compare<std::string>,std::allocator<std::pair<const std::string,CPTCensorStatusItem *>>,false>,
1> _Kty=std::string,
1> _Ty=CPTCensorStatusItem *,
1> _Nodety=std::_Tree_node<std::pair<const std::string,CPTCens...
Choice between vector::resize() and vector::reserve()
I am pre-allocating some memory to my a vector member variable. Below code is minimal part
4 Answers
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When is it acceptable to call GC.Collect?
...ading game level on XBox or WindowsPhone. On those platforms GC runs after allocating 1MB or sth like that. So it's good to allocate as much as you can during loading of the level (while showing some splash screen) and then do GC.Collect to try to avoid collections during the game.
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How do I tokenize a string in C++?
...ybe, but then we’re forced to perform (potentially redundant and costly) allocations.
Instead, C++ offers a plethora of ways to split strings based on arbitrarily complex delimiters, but none of them is encapsulated as nicely as in other languages. The numerous ways fill whole blog posts.
At its...
What is the difference between Google App Engine and Google Compute Engine?
...e docker to install s/w in GAE, does it mean google takes care of creating/allocating a linux instance with basic configurations and then runs docker on tops of it? In essence, compute engine adds additional responsibility of VM configs. Am I right?
– old-monk
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What does template mean?
...emplate template parameter.
template<template<typename T> class AllocatePolicy>
struct Pool {
void allocate(size_t n) {
int *p = AllocatePolicy<int>::allocate(n);
}
};
// pass the template "allocator" as argument.
template<typename T>
struct allocator { st...