Function isWhitespace

tests/catch.hpp:6369–6372

namespace TextFlow {

inline auto isWhitespace(char c) -> bool {
	static std::string chars = " \t\n\r";
	return chars.find(c) != std::string::npos;
}
inline auto isBreakableBefore(char c) -> bool {
	static std::string chars = "[({<|";
	return chars.find(c) != std::string::npos;