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What is a stack trace, and how can I use it to debug my application errors?
...t: [com.example.myproject.MyEntity]
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:96)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
at org.hibernate.id.insert.AbstractSelectingDelegate.performInsert(AbstractSelectingDele...
How to easily map c++ enums to strings
...s in some library header files that I'm using, and I want to have a way of converting enum values to user strings - and vice-versa.
...
Max or Default?
...e "Select CType(y.MyCounter, Integer?)". I have to do an original check to convert Nothing to 0 for my purposes, but I like getting the results without an exception.
– gfrizzle
Dec 5 '08 at 13:51
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How to Iterate over a Set/HashSet without an Iterator?
...
Converting your set into an array
may also help you for iterating over the elements:
Object[] array = set.toArray();
for(int i=0; i<array.length; i++)
Object o = array[i];
...
typecast string to integer - Postgres
...
If the value contains non-numeric characters, you can convert the value to an integer as follows:
SELECT CASE WHEN <column>~E'^\\d+$' THEN CAST (<column> AS INTEGER) ELSE 0 END FROM table;
The CASE operator checks the < column>, if it matches the integer pat...
What is a handle in C++?
...
Is it possible to convert a HANDLE into an equivalent in Linux? I have to migrate a program that uses HANDLE from Windows to Linux.
– Cornel Verster
Nov 4 '15 at 13:33
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Finding the average of a list
...r versions of Python you can do
sum(l) / len(l)
On Python 2 you need to convert len to a float to get float division
sum(l) / float(len(l))
There is no need to use reduce. It is much slower and was removed in Python 3.
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What is the size of ActionBar in pixels?
...ppose actionBarSize returns the dp value. I got the value 48dp. That means converting it to pixels gives me 96 pixels for xhdpi.
– Muhammad
Sep 3 '14 at 18:14
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Why are Standard iterator ranges [begin, end) instead of [begin, end]?
...hat were passed an array and a size.
void func(int* array, size_t size)
Converting to half-closed ranges [begin, end) is very simple when you have that information:
int* begin;
int* end = array + size;
for (int* it = begin; it < end; ++it) { ... }
To work with fully-closed ranges, it's har...
What does a tilde do when it precedes an expression?
...11 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
So ~ converts its operand to a 32 bit integer (bitwise operators in JavaScript do that)...
0000 0000 0000 0000 0000 0000 0000 0001
If it were a negative number, it'd be stored in 2's complement: invert all bits and add 1.
...a...