45 lines
888 B
C++
45 lines
888 B
C++
/* @file fixed.hpp */
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#pragma once
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#include <iostream>
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namespace xo {
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/* use:
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* ostream os = ...;
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*
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* os << fixed(3.1415926, 3)
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*
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* writes
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* 3.142
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*
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* on os, restoring stream's formatting+precision state
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*/
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class fixed {
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public:
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fixed(double x, uint16_t prec) : x_{x}, prec_{prec} {}
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/* print this value */
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double x_;
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/* precision */
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uint16_t prec_ = 0;
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}; /*fixed*/
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inline std::ostream &
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operator<<(std::ostream & s, fixed const & fx)
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{
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std::ios::fmtflags orig_flags = s.flags();
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std::streamsize orig_p = s.precision();
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s.flags(std::ios::fixed);
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s.precision(fx.prec_);
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s << fx.x_;
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s.flags(orig_flags);
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s.precision(orig_p);
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return s;
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} /*operator<<*/
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} /*namespace xo*/
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/* end fixed.hpp */
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