format
Curly brace string formatting for C++, like Python and C#.
Doesn't handle floating-point format specifiers or implicit argument indices yet,
but handles escaped braces "{{" correctly.
// char buf[32];
// sprintf(buf, "(%d, %f, %f)", vec.x, vec.y, vec.z); // spot the mistakes!
// std::stringstream ss;
// ss << "(" << vec.x << ", " << vec.y << ", " << vec.z << ")"; // ugly!
std::string s = format("({0}, {1}, {2})", vec.x, vec.y, vec.z); // yes!