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King_DuckZ 2017-04-04 20:58:40 +01:00
commit fea5b738df
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src/get_env.cpp Normal file
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#include "get_env.hpp"
#include "duckhandy/lexical_cast.hpp"
#include <cstdlib>
namespace tawashi {
boost::optional<boost::string_ref> get_env (const char* parName) {
using boost::string_ref;
using boost::make_optional;
using boost::optional;
const char* const raw_getvar = secure_getenv(parName);
return (raw_getvar ? make_optional(string_ref(raw_getvar)) : optional<string_ref>());
}
template <>
std::string get_env_as (const char* parName, const std::string& parDefault) {
auto var = get_env(parName);
return (var ? std::string(var->data(), var->size()) : parDefault);
}
template <>
boost::string_ref get_env_as (const char* parName, const boost::string_ref& parDefault) {
auto var = get_env(parName);
return (var ? *var : parDefault);
}
template <>
std::size_t get_env_as (const char* parName, const std::size_t& parDefault) {
using dhandy::lexical_cast;
auto var = get_env(parName);
return (var ? lexical_cast<std::size_t>(*var) : parDefault);
}
} //namespace tawashi