boost类型转换异常捕获

使用boost做类型转换出错会抛出异常，这里针对这种情况做了简单封装，内部捕获异常，支持默认值、浮点数转换。

#pragma once
#include <string>
#include <iomanip>
#include <boost/lexical_cast.hpp>
#include "logger.h"

template <typename Target, typename Source>
inline Target typecast(const Source &arg)
{
    try {
        return boost::lexical_cast<Target>(arg);
    } catch (boost::bad_lexical_cast &e) {
        LOGGER_ERROR("bad_lexical_cast error:" << e.what() << ", source:" << arg);
    } catch (...) {
        LOGGER_ERROR("bad_lexical_cast unkown error, source:" << arg);
    }
    return Target();
}

template <typename Target, typename Source>
inline Target typecast(const Source &arg, const Target &defaultValue)
{
    try {
        return boost::lexical_cast<Target>(arg);
    } catch (boost::bad_lexical_cast &e) {
        LOGGER_ERROR("bad_lexical_cast error:" << e.what() << ", source:" << arg);
    } catch (...) {
        LOGGER_ERROR("bad_lexical_cast unkown error, source:" << arg);
    }
    return defaultValue;
}

template <typename Target, typename Source>
inline bool try_typecast(const Source &arg, Target &target)
{
    try {
        target = boost::lexical_cast<Target>(arg);
        return true;
    } catch (boost::bad_lexical_cast &e) {
        LOGGER_ERROR("bad_lexical_cast error:" << e.what() << ", source:" << arg);
    } catch (...) {
        LOGGER_ERROR("bad_lexical_cast unkown error, source:" << arg);
    }
    return false;
}

template <typename Target, typename Source>
inline Target numcast(Source arg)
{
    try {
        return boost::numeric_cast<Target>(arg);
    } catch (boost::bad_numeric_cast &e) {
        LOGGER_ERROR("bad_numeric_cast error:" << e.what() << ", source:" << arg);
    } catch (...) {
        LOGGER_ERROR("bad_numeric_cast unkown error, source:" << arg);
    }
    return Target();
}

// 浮点数转换为字符串，精确到指定位数
template<typename Source>
inline std::string typecast_precision(const Source &arg, int precision)
{
    std::ostringstream oss;
    oss << std::fixed << std::setprecision(precision) << arg;
    return oss.str();
}

// 浮点数转换为字符串，精确到指定位数，去掉尾部0
template<typename Source>
inline std::string typecast_precision_trimzero(const Source &arg, int precision)
{
    std::string str = typecast_precision(arg, precision);
    std::size_t pos = str.find('.');
    if (pos == std::string::npos) {
        return str;
    }

    std::size_t pos2 = str.find_last_not_of('0');
    return str.erase(pos2 + ((pos == pos2) ? 0 : 1), std::string::npos);
}