C++设置使用配置类从txt文件中设置变量值

Question

我试图找出如何从txt文件或cfg文件设置变量值，现在我发现这个很好用的类很容易使用。

其完美的我的需求，但唯一的问题是，它只需要字符串和双打，但我需要设置整数/浮点值。

所以有人可以告诉我如何修改类，因此它需要整数和浮点数？

#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); 
}; 

这里的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

你可以做一种叫做typecast。将数据分配给double，然后将其更改为int。