standards

int n; int main() { [](){ n = 0; }(); // clang says "ok" int m; [](){ m = 0; }(); // clang says "not ok" } I just wonder: If the lambda captures nothing, is it allowed to access global variables as per the C++ standard? Yes, sure. Normal name lookup rules apply. [expr.prim.lambda]/7 ... for purposes of name lookup ... the compound-statement is considered in the context of the lambda-expression . Re: why local variables are treated differently from global ones. [expr.prim.lambda]/13 ... If a lambda-expression or an instantiation of the function call operator template of a generic lambda odr

I was writing this answer and I quoted from http://en.cppreference.com/w/cpp/string/byte/tolower#Parameters Is not representable as unsigned char and does not equal EOF, the behavior is undefined When I went to inspect the edit that had added this phrase I found that the author's comment: Can't use negative signed chars with any ctype.h function per C99 7.4/1 The author is citing from the C99 standard in C++ documentation. Is that valid? I couldn't find anything on the definition of this function in the C++ standard, so I must assume that it is valid. But this concerns me for 2 reasons: How

I'm using the H1 tag in my document as the main title, as you do. The text in the H1 is the title of the company, which needs to be shown on every page. I'm using the H2 tag for the title of the main content on each page. So the H1 is the same on every page, and the H2 changes. Example http://dev.darrenhall.info/temp/stackoverflow/h1/h1.gif I know that a lot of sites use the H1 to do what I'm doing with the H2, am I losing out by not doing this? I know that semantically I can't make the H1 into a H2 and vice versa, so I'm wondering what the best option is. Does it matter that my H1 is always

I am trying to make a simple python script that starts a subprocess and monitors its standard output. Here is a snippet from the code: process = subprocess.Popen([path_to_exe, os.path.join(temp_dir,temp_file)], stdout=subprocess.PIPE) while True: output=process.stdout.readline() print "test" The problem is that the script hangs on output=process.stdout.readline() and that the line print "test" only executes after the subprocess is terminated. Is there a way to read standard output and print it without having to wait for the subprocess to terminate? The subprocess which I am starting is a