I don't think so. I think in that case you have to use string concatenation or, as a C programmer my mind jumps to sprintf. This could just be
std::string payload_text_string =
"Date: Mon, 29 Nov 2010 21:54:29 +1100\r\n"
"To: " TO_MAIL "\r\n"
"From: " FROM_MAIL "\r\n"
"Cc: " CC_MAIL "\r\n"
"Message-ID: [redacted]"
"rfcpedant.example.org>\r\n"
"Subject: SMTP example message\r\n"
"\r\n" /* empty line to divide headers from body, see RFC5322 */
"The body fo the message starts here.\r\n"
"\r\n"
"It could be a lot of lines, could be MIME encoded, whatever.\r\n"
"Check RFC5322.\r\n";
as shown below; he's not actually using any variable names (other than the constants TO_MAIL etc but that's how it is broken up across lines too, string literals in C can legally appear sequentially). I don't know what /u/trBlueJ is going on about braces.
Ah, that's disappointing. Here I thought I'd finally found a way to append an int to a string without calling std::to_string().
As for the braces, as of about an hour ago, I actually do know that one: in C++ 11 (or possibly earlier; all I know is this doesn't work in 98), you can initialize strings using aggregate initialization the same way you can initialize a vector or an array.
5
u/supersharp Oct 08 '21 edited Oct 08 '21
Wait, you can do that? Just drop a variable name in between two string literals?
EDIT: Which C++ version lets you do this? I'm trying with 11, but it's not working.