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Is short-circuiting logical operators mandated? And evaluation order?
...nt after the evaluation of the first expression (12).
In C++ there is an extra trap: short-circuiting does NOT apply to types that overload operators || and &&.
Footnote 12: The operators indicated in this paragraph are the built-in operators, as described in clause 5. When one of thes...
UnicodeEncodeError: 'latin-1' codec can't encode character
...aracter to be used. You should also ideally tell MySQL you are using UTF-8 strings (by setting the database connection and the collation on string columns), so it can get case-insensitive comparison and sorting right.
share
...
How do pointer to pointers work in C?
...--+----+----+----+----+
What you can see here, is that at address 63 the string "hello" starts. So in this case, if this is the only occurrence of "hello" in memory then,
const char *c = "hello";
... defines c to be a pointer to the (read-only) string "hello", and thus contains the value 63. c ...
jsoncpp 不能处理__int64(long long)类型数据 - C/C++ - 清泛网 - 专注C/C++及内核技术
...显然这不是我程序的问题。
Test.cpp: In function ‘std::string createJsonData()’:
Test.cpp:41: error: conversion from ‘long long int’ to ‘const Json::Value’ is ambiguous
include/json/value.h:205: note: candidates are: Json::Value::Value(bool)
includ...
What should I do if two libraries provide a function with the same name generating a conflict?
...ding libraries in a hex editor and change all occurrences of the offending strings to something else. You should then be able to use the new names in all future calls.
UPDATE: I just did it on this end and it seems to work. Of course, I've not tested this thoroughly - it may be no more than a re...
How to rename items in values() in Django?
...
It's a bit hacky, but you could use the extra method:
MyModel.objects.extra(
select={
'renamed_value': 'cryptic_value_name'
}
).values(
'renamed_value'
)
This basically does SELECT cryptic_value_name AS renamed_value in the SQL.
Another option, if you al...
Undefined, unspecified and implementation-defined behavior
...
p[5] = 'w';
std::cout << p;
}
The variable p points to the string literal "hello!\n", and the two assignments below try to modify that string literal. What does this program do? According to section 2.14.5 paragraph 11 of the C++ standard, it invokes undefined behavior:
The effect o...
Why does changing the returned variable in a finally block not change the return value?
... object that s references. If s was a reference to a mutable object (which String is not) and the contents of the object were changed in the finally block, then those changes would be seen in the returned value.
The detailed rules for how all this operates can be found in Section 14.20.2 of the Java...
Replace non-numeric with empty string
...et passed "(913)-444-5555" or anything else, is there a quick way to run a string through some kind of special replace function that I can pass it a set of characters to allow?
...
Access-control-allow-origin with multiple domains
...e RESPONSE_Access_Control_Allow_Origin portion:
In Rewrite you can use any string after RESPONSE_ and it will create the Response Header using the rest of the word as the header name (in this case Access-Control-Allow-Origin). Rewrite uses underscores "_" instead of dashes "-" (rewrite converts them...