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  < span id = "projectnumber" > v0.7.0< / span >
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< a href = "#func-members" > Functions< / a > < / div >
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< div class = "title" > nlohmann::detail::dtoa_impl Namespace Reference< / div > < / div >
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< p > implements the Grisu2 algorithm for binary to decimal floating-point conversion.
< a href = "namespacenlohmann_1_1detail_1_1dtoa__impl.html#details" > More...< / a > < / p >
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Functions< / h2 > < / td > < / tr >
< tr class = "memitem:a22b6e37654ac93c6d0d9c06ec1bf5ded" > < td class = "memTemplParams" colspan = "2" > template< typename FloatType > < / td > < / tr >
< tr class = "memitem:a22b6e37654ac93c6d0d9c06ec1bf5ded" > < td class = "memTemplItemLeft" align = "right" valign = "top" > boundaries  < / td > < td class = "memTemplItemRight" valign = "bottom" > < a class = "el" href = "namespacenlohmann_1_1detail_1_1dtoa__impl.html#a22b6e37654ac93c6d0d9c06ec1bf5ded" > compute_boundaries< / a > (FloatType value)< / td > < / tr >
< tr class = "separator:a22b6e37654ac93c6d0d9c06ec1bf5ded" > < td class = "memSeparator" colspan = "2" >   < / td > < / tr >
< tr class = "memitem:adbf329a18c5cf854a3477327afd2200b" > < td class = "memItemLeft" align = "right" valign = "top" > cached_power  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "namespacenlohmann_1_1detail_1_1dtoa__impl.html#adbf329a18c5cf854a3477327afd2200b" > get_cached_power_for_binary_exponent< / a > (int e)< / td > < / tr >
< tr class = "separator:adbf329a18c5cf854a3477327afd2200b" > < td class = "memSeparator" colspan = "2" >   < / td > < / tr >
< tr class = "memitem:a36ded358763b5dbcea9867660fbe4e28" > < td class = "memItemLeft" align = "right" valign = "top" > int  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "namespacenlohmann_1_1detail_1_1dtoa__impl.html#a36ded358763b5dbcea9867660fbe4e28" > find_largest_pow10< / a > (const std::uint32_t n, std::uint32_t & pow10)< / td > < / tr >
< tr class = "separator:a36ded358763b5dbcea9867660fbe4e28" > < td class = "memSeparator" colspan = "2" >   < / td > < / tr >
< tr class = "memitem:a9b899c72b0e1e3dd46d75c2b4e6bcdfb" > < td class = "memItemLeft" align = "right" valign = "top" > void  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "namespacenlohmann_1_1detail_1_1dtoa__impl.html#a9b899c72b0e1e3dd46d75c2b4e6bcdfb" > grisu2_digit_gen< / a > (char *buffer, int & length, int & decimal_exponent, diyfp M_minus, diyfp w, diyfp M_plus)< / td > < / tr >
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< tr class = "memitem:aab7a9670a4f4704a5d0347ad7588576b" > < td class = "memTemplParams" colspan = "2" > template< typename FloatType > < / td > < / tr >
< tr class = "memitem:aab7a9670a4f4704a5d0347ad7588576b" > < td class = "memTemplItemLeft" align = "right" valign = "top" > void  < / td > < td class = "memTemplItemRight" valign = "bottom" > < a class = "el" href = "namespacenlohmann_1_1detail_1_1dtoa__impl.html#aab7a9670a4f4704a5d0347ad7588576b" > grisu2< / a > (char *buf, int & len, int & decimal_exponent, FloatType value)< / td > < / tr >
< tr class = "separator:aab7a9670a4f4704a5d0347ad7588576b" > < td class = "memSeparator" colspan = "2" >   < / td > < / tr >
< tr class = "memitem:ad90f19ed10d8133b727df4b9bc5ddf5c" > < td class = "memItemLeft" align = "right" valign = "top" > JSON_HEDLEY_RETURNS_NON_NULL char *  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "namespacenlohmann_1_1detail_1_1dtoa__impl.html#ad90f19ed10d8133b727df4b9bc5ddf5c" > append_exponent< / a > (char *buf, int e)< / td > < / tr >
< tr class = "memdesc:ad90f19ed10d8133b727df4b9bc5ddf5c" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > appends a decimal representation of e to buf < a href = "namespacenlohmann_1_1detail_1_1dtoa__impl.html#ad90f19ed10d8133b727df4b9bc5ddf5c" > More...< / a > < br / > < / td > < / tr >
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< tr class = "memdesc:ab441f2761e33839ca48bc2225e14a2a9" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > prettify v = buf * 10^decimal_exponent < a href = "namespacenlohmann_1_1detail_1_1dtoa__impl.html#ab441f2761e33839ca48bc2225e14a2a9" > More...< / a > < br / > < / td > < / tr >
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< a name = "details" id = "details" > < / a > < h2 class = "groupheader" > Detailed Description< / h2 >
< div class = "textblock" > < p > implements the Grisu2 algorithm for binary to decimal floating-point conversion. < / p >
< p > This implementation is a slightly modified version of the reference implementation which may be obtained from < a href = "http://florian.loitsch.com/publications" > http://florian.loitsch.com/publications< / a > (bench.tar.gz).< / p >
< p > The code is distributed under the MIT license, Copyright (c) 2009 Florian Loitsch.< / p >
< p > For a detailed description of the algorithm see:< / p >
< p > [1] Loitsch, "Printing Floating-Point Numbers Quickly and Accurately with
Integers", Proceedings of the ACM SIGPLAN 2010 Conference on Programming Language Design and Implementation, PLDI 2010 [2] Burger, Dybvig, "Printing Floating-Point Numbers Quickly and Accurately", Proceedings of the ACM SIGPLAN 1996 Conference on Programming Language Design and Implementation, PLDI 1996 < / p >
< / div > < h2 class = "groupheader" > Function Documentation< / h2 >
< a id = "a22b6e37654ac93c6d0d9c06ec1bf5ded" > < / a >
< h2 class = "memtitle" > < span class = "permalink" > < a href = "#a22b6e37654ac93c6d0d9c06ec1bf5ded" > ◆ < / a > < / span > compute_boundaries()< / h2 >
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template< typename FloatType > < / div >
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< td > (< / td >
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< p > Compute the (normalized) diyfp representing the input number 'value' and its boundaries.< / p >
< dl class = "section pre" > < dt > Precondition< / dt > < dd > value must be finite and positive < / dd > < / dl >
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< / div >
< a id = "adbf329a18c5cf854a3477327afd2200b" > < / a >
< h2 class = "memtitle" > < span class = "permalink" > < a href = "#adbf329a18c5cf854a3477327afd2200b" > ◆ < / a > < / span > get_cached_power_for_binary_exponent()< / h2 >
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< td class = "memname" > cached_power nlohmann::detail::dtoa_impl::get_cached_power_for_binary_exponent < / td >
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< p > For a normalized diyfp w = f * 2^e, this function returns a (normalized) cached power-of-ten c = f_c * 2^e_c, such that the exponent of the product w * c satisfies (Definition 3.2 from [1]) < / p > < pre class = "fragment" > alpha < = e_c + e + q < = gamma.
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< a id = "a36ded358763b5dbcea9867660fbe4e28" > < / a >
< h2 class = "memtitle" > < span class = "permalink" > < a href = "#a36ded358763b5dbcea9867660fbe4e28" > ◆ < / a > < / span > find_largest_pow10()< / h2 >
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< td class = "memname" > int nlohmann::detail::dtoa_impl::find_largest_pow10 < / td >
< td > (< / td >
< td class = "paramtype" > const std::uint32_t  < / td >
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< p > For n != 0, returns k, such that pow10 := 10^(k-1) < = n < 10^k. For n == 0, returns 1 and sets pow10 := 1. < / p >
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< h2 class = "memtitle" > < span class = "permalink" > < a href = "#a9b899c72b0e1e3dd46d75c2b4e6bcdfb" > ◆ < / a > < / span > grisu2_digit_gen()< / h2 >
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< td class = "memname" > void nlohmann::detail::dtoa_impl::grisu2_digit_gen < / td >
< td > (< / td >
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< p > Generates V = buffer * 10^decimal_exponent, such that M- < = V < = M+. M- and M+ must be normalized and share the same exponent -60 < = e < = -32. < / p >
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< a id = "a05b681dcb8569b9784c6dccfadb01633" > < / a >
< h2 class = "memtitle" > < span class = "permalink" > < a href = "#a05b681dcb8569b9784c6dccfadb01633" > ◆ < / a > < / span > grisu2() < span class = "overload" > [1/2]< / span > < / h2 >
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< p > v = buf * 10^decimal_exponent len is the length of the buffer (number of decimal digits) The buffer must be large enough, i.e. > = max_digits10. < / p >
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< a id = "aab7a9670a4f4704a5d0347ad7588576b" > < / a >
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< td class = "memname" > void nlohmann::detail::dtoa_impl::grisu2 < / td >
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< td class = "paramname" > < em > buf< / em > , < / td >
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< p > v = buf * 10^decimal_exponent len is the length of the buffer (number of decimal digits) The buffer must be large enough, i.e. > = max_digits10. < / p >
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< h2 class = "memtitle" > < span class = "permalink" > < a href = "#ad90f19ed10d8133b727df4b9bc5ddf5c" > ◆ < / a > < / span > append_exponent()< / h2 >
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< td class = "memname" > JSON_HEDLEY_RETURNS_NON_NULL char* nlohmann::detail::dtoa_impl::append_exponent < / td >
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< td class = "paramtype" > char *  < / td >
< td class = "paramname" > < em > buf< / em > , < / td >
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< td class = "paramname" > < em > e< / em >   < / td >
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< p > appends a decimal representation of e to buf < / p >
< dl class = "section return" > < dt > Returns< / dt > < dd > a pointer to the element following the exponent. < / dd > < / dl >
< dl class = "section pre" > < dt > Precondition< / dt > < dd > -1000 < e < 1000 < / dd > < / dl >
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< h2 class = "memtitle" > < span class = "permalink" > < a href = "#ab441f2761e33839ca48bc2225e14a2a9" > ◆ < / a > < / span > format_buffer()< / h2 >
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< td class = "paramname" > < em > buf< / em > , < / td >
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< td class = "paramname" > < em > len< / em > , < / td >
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< td class = "paramkey" > < / td >
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< p > prettify v = buf * 10^decimal_exponent < / p >
< p > If v is in the range [10^min_exp, 10^max_exp) it will be printed in fixed-point notation. Otherwise it will be printed in exponential notation.< / p >
< dl class = "section pre" > < dt > Precondition< / dt > < dd > min_exp < 0 < / dd >
< dd >
max_exp > 0 < / dd > < / dl >
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< li class = "navelem" > < a class = "el" href = "namespacenlohmann.html" > nlohmann< / a > < / li > < li class = "navelem" > < a class = "el" href = "namespacenlohmann_1_1detail.html" > detail< / a > < / li > < li class = "navelem" > < a class = "el" href = "namespacenlohmann_1_1detail_1_1dtoa__impl.html" > dtoa_impl< / a > < / li >
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