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/* Copyright (c) 1997-2024
Ewgenij Gawrilow, Michael Joswig, and the polymake team
Technische Universität Berlin, Germany
https://polymake.org
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version: http://www.gnu.org/licenses/gpl.txt.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
--------------------------------------------------------------------------------
*/
#pragma once
#include <string>
#include <cstring>
namespace polymake {
//! Convenience wrapper for strings passed to various functions.
//! @note: it does not own any resources, it merely conveys a reference to data stored elsewhere.
struct AnyString {
template <size_t n>
AnyString(const char (&s)[n])
: ptr(s+0)
, len(n-1) {}
AnyString(const std::string& s)
: ptr(s.c_str())
, len(s.size()) {}
AnyString(std::nullptr_t)
: ptr(nullptr)
, len(0) {}
AnyString()
: AnyString(nullptr) {}
AnyString(const char* p, size_t l)
: ptr(p)
, len(l) {}
explicit operator bool() const { return ptr != nullptr; }
friend
std::string operator+ (const AnyString& s1, const AnyString& s2)
{
std::string s(s1.ptr, s1.len);
s.append(s2.ptr, s2.len);
return s;
}
friend
std::string&& operator+ (std::string&& s1, const AnyString& s2)
{
s1.append(s2.ptr, s2.len);
return std::move(s1);
}
template <size_t n>
friend
std::string operator+ (const char (&s1)[n], const AnyString& s2)
{
return AnyString(s1) + s2;
}
const char* ptr;
size_t len;
};
// useful in conditional expressions:
// instead of x ? "X" : "NOT_X"
// write x ? Str("X") : Str("NOT_X")
// in order to avoid gratuitous strlen() calls
template <size_t n>
inline
AnyString Str(const char (&s)[n])
{
return AnyString(s);
}
inline
AnyString CStr(const char* s)
{
return AnyString(s, strlen(s));
}
}
// for a transitional period:
namespace pm {
using polymake::AnyString;
using polymake::Str;
using polymake::CStr;
}
// Local Variables:
// mode:C++
// c-basic-offset:3
// indent-tabs-mode:nil
// End:
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