std::nan, std::nanf, std::nanl
From cppreference.com
Template:cpp/numeric/math/sidebar Template:ddcl list begin <tr class="t-dsc-header">
<td>Defined in header
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<cmath>
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<td >float nanf( const char* arg );
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<td class="t-dcl-nopad"> </td> <td > Template:mark c++11 feature </td> </tr> <tr class="t-dcl ">
<td >double nan( const char* arg );
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<td class="t-dcl-nopad"> </td> <td > Template:mark c++11 feature </td> </tr> <tr class="t-dcl ">
<td >long double nanl( const char* arg );
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<td class="t-dcl-nopad"> </td> <td > Template:mark c++11 feature </td> </tr> Template:ddcl list end
Converts the implementation-defined character string arg into the corresponding quiet NaN value. The call Template:cpp is equivalent to the call Template:cpp.
Parameters
| arg | - | narrow character string identifying the contents of a NaN, or an empty string |
Return value
The NaN value that corresponds to the identifying string arg or zero if the implemntation does not support quiet NaNs.
See also
| [static] |
returns a quiet NaN value of the given floating-point type (public static member function of std::numeric_limits<T>)
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