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Code

make type_name a member function

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This commit is contained in:
Lu Wang 2013-01-30 02:48:05 +08:00
parent d987294082
commit b2ae01a2fa
2 changed files with 18 additions and 20 deletions
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4
src/util/ArgParser.cc
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@ -146,6 +146,10 @@ void ArgParser::show_usage(ostream & out) const
}
}
template<> const char * ArgParser::get_type_name<int> (void) { return "int"; }
template<> const char * ArgParser::get_type_name<double> (void) { return "fp"; }
template<> const char * ArgParser::get_type_name<string> (void) { return "string"; }
ArgParser::ArgEntryBase::ArgEntryBase(const char * name, const char * description, bool need_arg)
: shortname(0), name(name), description(description), need_arg(need_arg)
{

34
src/util/ArgParser.h
View File

@ -39,24 +39,6 @@ void dump_value(std::ostream & out, const T & v)
extern void dump_value(std::ostream & out, const std::string & v);
// type names helper
template<typename>
struct type_name {
static char const* value() { return "unknown"; }
};
template<> struct type_name<int> {
static char const* value() { return "int"; }
};
template<> struct type_name<double> {
static char const* value() { return "fp"; }
};
template<> struct type_name<std::string> {
static char const* value() { return "string"; }
};
class ArgParser
{
public:
@ -71,13 +53,20 @@ class ArgParser
ArgParser & add(const char * optname, const char * description, ArgParserCallBack callback = nullptr);
/*
* location == nullptr means no argument is needed
*/
template <class T, class Tv>
ArgParser & add(const char * optname, T * location, const Tv & default_value, const char * description, ArgParserCallBack callback = nullptr, bool dont_show_default = false);
ArgParser & add(const char * optname, T * location, const Tv & default_value, const char * description, ArgParserCallBack callback = nullptr, bool dont_show_default = false);
void parse(int argc, char ** argv) const;
void show_usage(std::ostream & out) const;
private:
// type names helper
template<class>
static const char * get_type_name(void) { return "unknown"; }
class ArgEntryBase
{
public:
@ -127,6 +116,11 @@ ArgParser & ArgParser::add(const char * optname, T * location, const Tv & defaul
return *this;
}
// Known types
template<> const char * ArgParser::get_type_name<int> (void);
template<> const char * ArgParser::get_type_name<double> (void);
template<> const char * ArgParser::get_type_name<std::string> (void);
template<class T, class Tv>
ArgParser::ArgEntry<T, Tv>::ArgEntry(const char * name, T * location, const Tv & default_value, ArgParserCallBack callback, const char * description, bool dont_show_default)
: ArgEntryBase(name, description, (location != nullptr))
@ -178,7 +172,7 @@ void ArgParser::ArgEntry<T, Tv>::show_usage(std::ostream & out) const
if(need_arg)
{
sout << " <" << type_name<T>::value() << ">";
sout << " <" << get_type_name<T>() << ">";
}
std::string s = sout.str();