변환 오류를 처리하는 동안 C에서 문자열을 정수로 변환하려면 어떻게 해야 합니까?

<code class="cpp">#include <boost/lexical_cast.hpp>

try {
    int i = boost::lexical_cast<int>(s);
    // Success handling
} catch(...) {
    // Failure handling
}</code>

<code class="cpp">#include <iostream>
#include <sstream>
#include <string>

try {
    std::stringstream ss(s);
    int i;
    if ((ss >> i).fail() || !(ss >> std::ws).eof())
        throw std::bad_cast();
    // Success handling
} catch(...) {
    // Failure handling
}</code>

<code class="cpp">template <typename T>
T lexical_cast(const std::string& s) {
    std::stringstream ss(s);
    T result;
    if ((ss >> result).fail() || !(ss >> std::ws).eof())
        throw std::bad_cast();
    return result;
}</code>

<code class="cpp">template <typename T>
bool lexical_cast(const std::string& s, T& t) {
    try {
        t = lexical_cast<T>(s);
        return true;
    } catch (const std::bad_cast& e) {
        return false;
    }
}</code>