From the C++ Standard The type of a floating literal is double unless explicitly specified by a suffix. The suffixes f and F specify float, the suffixes l and L specify long double. It is interesting to compare with corresponding paragraph of the C Standard. In C there is used term floating constant instead of … Read more
Because in C character constants, such as ‘a’ have the type int. There’s a C FAQ about this suject: Perhaps surprisingly, character constants in C are of type int, so sizeof(‘a’) is sizeof(int) (though this is another area where C++ differs).
scala> val sum2 = (a: Int) => {implicit b: Int => a + b} sum2: (Int) => (Int) => Int = <function1> This will just make b an implicit value for the scope of the function body, so you can call methods that expect an implicit Int. I don’t think you can have implicit arguments … Read more
What is the problem? The problem is that the Standard forbids it. Per paragraph 13.5.8./3 of the C++11 Standard on user-defined literals: The declaration of a literal operator shall have a parameter-declaration-clause equivalent to one of the following: const char* unsigned long long int long double char wchar_t char16_t char32_t const char*, std::size_t const wchar_t*, … Read more
@ is not related to any method. It means that you don’t need to escape special characters in the string following to the symbol: @”c:\temp” is equal to “c:\\temp” Such string is called ‘verbatim’ or @-quoted. See MSDN.
From section 1.1 Boolean Datatype of the docs: SQLite does not have a separate Boolean storage class. Instead, Boolean values are stored as integers 0 (false) and 1 (true). So it looks like you are stuck with 0 and 1.
The f suffix makes it a single precision(float) literal instead of a double precision literal. This usually means 32 bit instead of 64 bit floats. Floating-point constants default to type double. By using the suffixes f or l (or F or L — the suffix is not case sensitive), the constant can be specified as … Read more
Short answer: it cannot be done. Long answer: the format! macro (and its derivatives) requires a string literal, that is a string known at compilation-time. In exchange for this requirement, if the arguments provided do not match the format, a compilation error is raised. What you are looking for is known as a template engine. … Read more
According to Rationale for International Standard – Programming Languages C §6.4.4.1 Integer constants A proposal to add binary constants was rejected due to lack of precedent and insufficient utility. It’s not in standard C, but GCC supports it as an extension, prefixed by 0b or 0B: i = 0b101010; See here for detail.
They have the same end result, but they are not the same (they’ll produce different bytecode; the new String(“foo”).intern() version actually goes through those steps, producing a new string object, then interning it). Two relevant quotes from String#intern: When the intern method is invoked, if the pool already contains a string equal to this String … Read more