C++設置使用配置類從txt文件中設置變量值

Question

我試圖找出如何從txt文件或cfg文件設置變量值，現在我發現這個很好用的類很容易使用。

其完美的我的需求，但唯一的問題是，它只需要字符串和雙打，但我需要設置整數/浮點值。

所以有人可以告訴我如何修改類，因此它需要整數和浮點數？

#include "Chameleon.h" 

class ConfigFile { 
    std::map<std::string,Chameleon> content_; 

public: 
    ConfigFile(std::string const& configFile); 

    Chameleon const& Value(std::string const& section, std::string const& entry) const; 

    Chameleon const& Value(std::string const& section, std::string const& entry, double value); 
    Chameleon const& Value(std::string const& section, std::string const& entry, std::string const& value); 
}; 

這裏的ConfigFile.cpp

std::string trim(std::string const& source, char const* delims = " \t\r\n") { 
    std::string result(source); 
    std::string::size_type index = result.find_last_not_of(delims); 
    if(index != std::string::npos) 
    result.erase(++index); 

    index = result.find_first_not_of(delims); 
    if(index != std::string::npos) 
    result.erase(0, index); 
    else 
    result.erase(); 
    return result; 
} 

ConfigFile::ConfigFile(std::string const& configFile) { 
    std::ifstream file(configFile.c_str()); 

    std::string line; 
    std::string name; 
    std::string value; 
    std::string inSection; 
    int posEqual; 
    while (std::getline(file,line)) { 

    if (! line.length()) continue; 

    if (line[0] == '#') continue; 
    if (line[0] == ';') continue; 

    if (line[0] == '[') { 
     inSection=trim(line.substr(1,line.find(']')-1)); 
     continue; 
    } 

    posEqual=line.find('='); 
    name = trim(line.substr(0,posEqual)); 
    value = trim(line.substr(posEqual+1)); 

    content_[inSection+'/'+name]=Chameleon(value); 
    } 
} 

Chameleon const& ConfigFile::Value(std::string const& section, std::string const& entry) const { 

    std::map<std::string,Chameleon>::const_iterator ci = content_.find(section + '/' + entry); 

    if (ci == content_.end()) throw "does not exist"; 

    return ci->second; 
} 

Chameleon const& ConfigFile::Value(std::string const& section, std::string const& entry, double value) { 
    try { 
    return Value(section, entry); 
    } catch(const char *) { 
    return content_.insert(std::make_pair(section+'/'+entry, Chameleon(value))).first->second; 
    } 
} 

Chameleon const& ConfigFile::Value(std::string const& section, std::string const& entry, std::string const& value) { 
    try { 
    return Value(section, entry); 
    } catch(const char *) { 
    return content_.insert(std::make_pair(section+'/'+entry, Chameleon(value))).first->second; 
    } 
} 

Answer 1

你可以做一種叫做typecast。將數據分配給double，然後將其更改爲int。