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How do you check in python whether a string contains only numbers?
...u'll want to use the isdigit method on your str object:
if len(isbn) == 10 and isbn.isdigit():
From the isdigit documentation:
str.isdigit()
Return True if all characters in the string are digits and there is at least one character, False otherwise. Digits include decimal characters and digits tha...
内存管理内幕：动态分配的选择、折衷和实现 - C/C++ - 清泛网 - 专注C/C++及内核技术
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managed_memory_start = last_valid_address;
/* Okay, we're initialized and ready to go */
has_initialized = 1;
}
现在，为了完全地管理内存，我们需要能够追踪要分配和回收哪些内存。在对内存块进行了 free 调用之后，我们需要做的是诸如将它...
C state-machine design [closed]
I am crafting a small project in mixed C and C++. I am building one small-ish state-machine at the heart of one of my worker thread.
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When vectors are allocated, do they use memory on the heap or the stack?
... store.
vector<Type*> vect;
will allocate the vector on the stack and a bunch of pointers on the free store, but where these point is determined by how you use them (you could point element 0 to the free store and element 1 to the stack, say).
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Can a pointer to base point to an array of derived objects?
I went to a job interview today and was given this interesting question.
3 Answers
3
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Incompatible implicit declaration of built-in function ‘malloc’
...y the reason for the warning. Ex: a x64 platform with 64-bit data pointers and 32-bit int values will puke goat feces, while a x86 32bit-data-pointer/32bit-int can seemingly work correctly. Neither are correct, as in neither case is the compiler aware of what malloc actually returns, and assumes int...
How to copy files from 'assets' folder to sdcard?
...red Dec 25 '10 at 12:43
Rohith NandakumarRohith Nandakumar
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What are copy elision and return value optimization?
...to a copy or move constructor is elided, that constructor must still exist and must be accessible. This ensures that copy elision does not allow copying objects which are not normally copyable, e.g. because they have a private or deleted copy/move constructor.
C++17: As of C++17, Copy Elision is gua...
How to set OnClickListener on a RadioButton in Android?
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I'd think a better way is to use RadioGroup and set the listener on this to change and update the View accordingly (saves you having 2 or 3 or 4 etc listeners).
RadioGroup radioGroup = (RadioGroup) findViewById(R.id.yourRadioGroup);
radioGroup.setOnChe...
Set database timeout in Entity Framework
My command keeps timing out, so I need to change the default command timeout value.
9 Answers
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