// Top of estring.cpp:
#include <iomanip>
#include <sstream>
// Wherever you like in estring.cpp:
string html_color(int x) {
std::stringstream res;
res << "#"
<< std::setbase(16) << std::setfill('0') << std::setw(6) << std::uppercase
<< (((x & 0xFF0000) >> 16) | (x & 0x00FF00) | ((x & 0x0000FF) << 16));
return res.str();
}
// Wherever you like in estring.h:
string html_color(int x);
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