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Legibilidade com C++14 - get_numeric
struct numerical_appender {
numerical_appender(std::string &buf) : _buf(buf) { }
void operator()(const char c) {
if( c >= '0' && c <= '9' ) _buf.push_back(c);
std::string &_buf;
void get_numeric(const std::string &input, std::string &output)
numerical_appender appender(output);
std::for_each(input.begin(), input.end(), appender);
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