The normal model of Java string length String.length() is specified as returning the number of char values (“code units”) in the String. That is the most generally useful definition of the length of a Java String; see below. Your description1 of the semantics of length based on the size of the backing array/array slice is … Read more
Take a look at -ftrapv and -fwrapv: -ftrapv This option generates traps for signed overflow on addition, subtraction, multiplication operations. -fwrapv This option instructs the compiler to assume that signed arithmetic overflow of addition, subtraction and multiplication wraps around using twos-complement representation. This flag enables some optimizations and disables other. This option is enabled by … Read more
Yes. It’s usually defined as something like the following (on 32-bit systems): typedef unsigned int size_t; Reference: C++ Standard Section 18.1 defines size_t is in <cstddef> which is described in C Standard as <stddef.h>. C Standard Section 4.1.5 defines size_t as an unsigned integral type of the result of the sizeof operator
On storage duration: 2.13.4 Ordinary string literals and UTF-8 string literals are also referred to as narrow string literals. A narrow string literal has type “array of n const char”, where n is the size of the string as defined below, and has static storage duration read in conjunction with 3.7.1 3.7.1. All objects which … Read more
In order to provide the amortized constant time complexity required by range, filter_view::begin caches the result in *this. This modifies the internal state of *this and thus cannot be done in a const member function.
From N3337: [basic.fundamental/8]: There are three floating point types: float, double, and long double. The type double provides at least as much precision as float, and the type long double provides at least as much precision as double. The set of values of the type float is a subset of the set of values of … Read more
In 4. “Conformance” §6, there is: A conforming implementation may have extensions (including additional library functions), provided they do not alter the behavior of any strictly conforming program. with the immediate conclusion in a footnote: This implies that a conforming implementation reserves no identifiers other than those explicitly reserved in this International Standard. The reserved … Read more
Just blindly calling exit() somewhere in your program is considered bad for a simple reason: It does not properly shutdown other threads (they just get terminated), it does not properly flush all buffers (stdio files are flushed) and guarantee a consistent and valid state of permanent/shared resources (files/shared memory/other ways to communicate). Still, if you … Read more
For a while, n3291 was available from the obvious URL (just search and replace n3242 with n3291 in the Wikipedia link). But I guess somebody decided that was too close to the final version so it is no longer accessible. Thus Wikipedia does not link to it because there is nothing to link to. I … Read more
The section that allowed the implicit int rule in C89 would be section 3.5.2 Type specifiers which says (emphasis mine): int , signed , signed int , or no type specifiers Keith Thompson in the comments points out that in C90 the section is 6.5.2 and says, The only difference is some introductory material required … Read more