stringTemplates.C

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    Copyright (C) 2018 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
    OpenFOAM 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 3 of the License, or
    (at your option) any later version.
 
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    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
\*---------------------------------------------------------------------------*/
 
#include <cstdio>
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
// Could also consider generalizing with C++11 variadic templates
 
template<class PrimitiveType>
std::string::size_type Foam::string::string_printf
(
    std::string& output,
    const char* fmt,
    const PrimitiveType& val
)
{
    // Use snprintf with zero to establish the size (without '\0') required
    int n = ::snprintf(nullptr, 0, fmt, val);
    if (n > 0)
    {
        output.resize(n+1);
        char* buf = &(output[0]);
 
        // Print directly into buffer, no stripping desired
        n = ::snprintf(buf, n+1, fmt, val);
        output.resize(n);
    }
    else
    {
        output.clear();
    }
 
    return output.size();
}
 
 
template<class PrimitiveType>
std::string::size_type Foam::string::string_printf
(
    std::string& output,
    const std::string& fmt,
    const PrimitiveType& val
)
{
    return string_printf(output, fmt.c_str(), val);
}
 
 
// ************************************************************************* //