Between the Evas examples, there is one in which one creates a canvas bound to the Evas {\bfseries{buffer}} engine and uses its pixel contents to create an PPM image on disk.

There, one does that by creating the canvas \char`\"{}by hand\char`\"{}, with {\ttfamily \mbox{\hyperlink{group__Evas__Canvas_gaff177702a6d5dd364896269a4a81822d}{evas\+\_\+new()}}}, {\ttfamily \mbox{\hyperlink{group__Evas__Canvas_gaf3efb2e687b20b3ba6df18151558b16c}{evas\+\_\+engine\+\_\+info\+\_\+set()}}}, etc.

On this example, we accomplish the very same task, but by using the {\ttfamily Ecore\+\_\+\+Evas} helper wrapper functions on a buffer engine canvas. If you compare both codes, you\textquotesingle{}ll see how much code one is saved from by using the {\ttfamily Ecore\+\_\+\+Evas} wrapper functions.

The code is simple as it can be. After instantianting our canvas window, with \mbox{\hyperlink{group__Ecore__Evas__Group_gab5e52f58b90c0789138f5443f02e23a2}{ecore\+\_\+evas\+\_\+buffer\+\_\+new()}}, we grab its canvas pointer and create the desired objects scene on it, which in this case is formed by 3 rectangles over the top left corner of a white background\+:  
\begin{DoxyCodeInclude}{0}
\DoxyCodeLine{main(\textcolor{keywordtype}{void})}
\DoxyCodeLine{\{}
\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Canvas_ga5ff87cc4ce6bc43e3b640a6d37f73043}{Evas}}\ *canvas;}
\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Object__Group_ga9e19e6dd1f517a0ba437c0114d3e7c97}{Evas\_Object}}\ *bg,\ *r1,\ *r2,\ *r3;}
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\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Ecore__Evas__Group_ga32ddbb6457033ad435a177eb0c4fe235}{ecore\_evas\_init}}();}
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\DoxyCodeLine{\ \ \ ee\ =\ \mbox{\hyperlink{group__Ecore__Evas__Group_gab5e52f58b90c0789138f5443f02e23a2}{ecore\_evas\_buffer\_new}}(WIDTH,\ HEIGHT);}
\DoxyCodeLine{\ \ \ \textcolor{keywordflow}{if}\ (!ee)\ \textcolor{keywordflow}{goto}\ error;}
\DoxyCodeLine{}
\DoxyCodeLine{\ \ \ canvas\ =\ \mbox{\hyperlink{group__Ecore__Evas__Group_ga6f8d214cd55bc940d7cc62fecd8dbc06}{ecore\_evas\_get}}(ee);}
\DoxyCodeLine{}
\DoxyCodeLine{\ \ \ bg\ =\ \mbox{\hyperlink{group__Evas__Object__Rectangle_ga1b7a9d8e6ce240590c1734da5f3449d2}{evas\_object\_rectangle\_add}}(canvas);}
\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Object__Group__Basic_gab751e9d24c16e74af6f7c08ea5b930c2}{evas\_object\_color\_set}}(bg,\ 255,\ 255,\ 255,\ 255);\ \textcolor{comment}{/*\ white\ bg\ */}}
\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Object__Group_ga335c8ee6eaeaac9710656af4f8b0db91}{evas\_object\_move}}(bg,\ 0,\ 0);\ \textcolor{comment}{/*\ at\ origin\ */}}
\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Object__Group_gacad94595f83580c18908cb3b69b08d1a}{evas\_object\_resize}}(bg,\ WIDTH,\ HEIGHT);\ \textcolor{comment}{/*\ covers\ full\ canvas\ */}}
\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Object__Group__Basic_ga07208fcafd4739de606bc35fff684bf5}{evas\_object\_show}}(bg);}
\DoxyCodeLine{}
\DoxyCodeLine{\ \ \ r1\ =\ \mbox{\hyperlink{group__Evas__Object__Rectangle_ga1b7a9d8e6ce240590c1734da5f3449d2}{evas\_object\_rectangle\_add}}(canvas);}
\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Object__Group__Basic_gab751e9d24c16e74af6f7c08ea5b930c2}{evas\_object\_color\_set}}(r1,\ 255,\ 0,\ 0,\ 255);\ \textcolor{comment}{/*\ 100\%\ opaque\ red\ */}}
\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Object__Group_ga335c8ee6eaeaac9710656af4f8b0db91}{evas\_object\_move}}(r1,\ 10,\ 10);}
\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Object__Group_gacad94595f83580c18908cb3b69b08d1a}{evas\_object\_resize}}(r1,\ 100,\ 100);}
\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Object__Group__Basic_ga07208fcafd4739de606bc35fff684bf5}{evas\_object\_show}}(r1);}
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\DoxyCodeLine{\ \ \ r2\ =\ \mbox{\hyperlink{group__Evas__Object__Rectangle_ga1b7a9d8e6ce240590c1734da5f3449d2}{evas\_object\_rectangle\_add}}(canvas);}
\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Object__Group__Basic_gab751e9d24c16e74af6f7c08ea5b930c2}{evas\_object\_color\_set}}(r2,\ 0,\ 128,\ 0,\ 128);\ \textcolor{comment}{/*\ 50\%\ opaque\ green\ */}}
\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Object__Group_ga335c8ee6eaeaac9710656af4f8b0db91}{evas\_object\_move}}(r2,\ 10,\ 10);}
\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Object__Group_gacad94595f83580c18908cb3b69b08d1a}{evas\_object\_resize}}(r2,\ 50,\ 50);}
\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Object__Group__Basic_ga07208fcafd4739de606bc35fff684bf5}{evas\_object\_show}}(r2);}
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\DoxyCodeLine{\ \ \ r3\ =\ \mbox{\hyperlink{group__Evas__Object__Rectangle_ga1b7a9d8e6ce240590c1734da5f3449d2}{evas\_object\_rectangle\_add}}(canvas);}
\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Object__Group__Basic_gab751e9d24c16e74af6f7c08ea5b930c2}{evas\_object\_color\_set}}(r3,\ 0,\ 128,\ 0,\ 255);\ \textcolor{comment}{/*\ 100\%\ opaque\ dark\ green\ */}}
\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Object__Group_ga335c8ee6eaeaac9710656af4f8b0db91}{evas\_object\_move}}(r3,\ 60,\ 60);}
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\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Object__Group__Basic_ga07208fcafd4739de606bc35fff684bf5}{evas\_object\_show}}(r3);}

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 Since it\textquotesingle{}s a buffer canvas and we\textquotesingle{}re using it to only save its contents on a file, we even needn\textquotesingle{}t \mbox{\hyperlink{group__Ecore__Evas__Group_ga4953047ff97d4f1b0d75a7d513d4f317}{ecore\+\_\+evas\+\_\+show()}} it. We make it render itself, forcefully, without the aid of Ecore\textquotesingle{}s main loop, with \mbox{\hyperlink{group__Ecore__Evas__Group_ga93a1c660785fbb2ded46e2bd184e1c04}{ecore\+\_\+evas\+\_\+manual\+\_\+render()}}\+:  
\begin{DoxyCodeInclude}{0}
\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Ecore__Evas__Group_ga93a1c660785fbb2ded46e2bd184e1c04}{ecore\_evas\_manual\_render}}(ee);}

\end{DoxyCodeInclude}
 And we\textquotesingle{}re ready to save the window\textquotesingle{}s shiny rendered contents as a simple PPM image. We do so by grabbing the pixels of the {\ttfamily Ecore\+\_\+\+Evas\textquotesingle{}} internal canvas, with \mbox{\hyperlink{group__Ecore__Evas__Group_gadb3a75f7fd11a63551573373e5ab30c4}{ecore\+\_\+evas\+\_\+buffer\+\_\+pixels\+\_\+get()}}\+:  
\begin{DoxyCodeInclude}{0}
\DoxyCodeLine{\_scene\_save(\mbox{\hyperlink{group__Evas__Canvas_ga5ff87cc4ce6bc43e3b640a6d37f73043}{Evas}}\ *canvas,}
\DoxyCodeLine{\ \ \ \ \ \ \ \ \ \ \ \ \textcolor{keyword}{const}\ \textcolor{keywordtype}{char}\ *dest)}
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\DoxyCodeLine{\ \ \ \textcolor{keyword}{const}\ \textcolor{keywordtype}{unsigned}\ \textcolor{keywordtype}{int}\ *pixels,\ *pixels\_end;}
\DoxyCodeLine{\ \ \ \textcolor{keywordtype}{int}\ width,\ height;}
\DoxyCodeLine{\ \ \ FILE\ *f;}
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\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Canvas_ga9db9974a647850d7bd49afb506c9717a}{evas\_output\_size\_get}}(canvas,\ \&width,\ \&height);}
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\DoxyCodeLine{\ \ \ f\ =\ fopen(dest,\ \textcolor{stringliteral}{"{}wb+"{}});}
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\DoxyCodeLine{\ \ \ \ \ \{}
\DoxyCodeLine{\ \ \ \ \ \ \ \ fprintf(stderr,\ \textcolor{stringliteral}{"{}ERROR:\ could\ not\ open\ for\ writing\ '\%s':\ \%s\(\backslash\)n"{}},}
\DoxyCodeLine{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ dest,\ strerror(errno));}
\DoxyCodeLine{\ \ \ \ \ \ \ \ \textcolor{keywordflow}{return};}
\DoxyCodeLine{\ \ \ \ \ \}}

\end{DoxyCodeInclude}
 
\begin{DoxyCodeInclude}{0}
\DoxyCodeLine{\textcolor{comment}{/*\ support\ function\ to\ save\ scene\ as\ PPM\ image\ */}}
\DoxyCodeLine{\textcolor{keyword}{static}\ \textcolor{keywordtype}{void}}
\DoxyCodeLine{\_scene\_save(\mbox{\hyperlink{group__Evas__Canvas_ga5ff87cc4ce6bc43e3b640a6d37f73043}{Evas}}\ *canvas,}
\DoxyCodeLine{\ \ \ \ \ \ \ \ \ \ \ \ \textcolor{keyword}{const}\ \textcolor{keywordtype}{char}\ *dest)}
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\DoxyCodeLine{\ \ \ \textcolor{keyword}{const}\ \textcolor{keywordtype}{unsigned}\ \textcolor{keywordtype}{int}\ *pixels,\ *pixels\_end;}
\DoxyCodeLine{\ \ \ \textcolor{keywordtype}{int}\ width,\ height;}
\DoxyCodeLine{\ \ \ FILE\ *f;}
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\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Canvas_ga9db9974a647850d7bd49afb506c9717a}{evas\_output\_size\_get}}(canvas,\ \&width,\ \&height);}
\DoxyCodeLine{}
\DoxyCodeLine{\ \ \ f\ =\ fopen(dest,\ \textcolor{stringliteral}{"{}wb+"{}});}
\DoxyCodeLine{\ \ \ \textcolor{keywordflow}{if}\ (!f)}
\DoxyCodeLine{\ \ \ \ \ \{}
\DoxyCodeLine{\ \ \ \ \ \ \ \ fprintf(stderr,\ \textcolor{stringliteral}{"{}ERROR:\ could\ not\ open\ for\ writing\ '\%s':\ \%s\(\backslash\)n"{}},}
\DoxyCodeLine{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ dest,\ strerror(errno));}
\DoxyCodeLine{\ \ \ \ \ \ \ \ \textcolor{keywordflow}{return};}
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\DoxyCodeLine{\ \ \ pixels\ =\ \mbox{\hyperlink{group__Ecore__Evas__Group_gadb3a75f7fd11a63551573373e5ab30c4}{ecore\_evas\_buffer\_pixels\_get}}(ee);}
\DoxyCodeLine{\ \ \ pixels\_end\ =\ pixels\ +\ (width\ *\ height);}
\DoxyCodeLine{}
\DoxyCodeLine{\ \ \ \textcolor{comment}{/*\ PPM\ P6\ format\ is\ dead\ simple\ to\ write:\ */}}
\DoxyCodeLine{\ \ \ fprintf(f,\ \textcolor{stringliteral}{"{}P6\(\backslash\)n\%d\ \%d\(\backslash\)n255\(\backslash\)n"{}},\ width,\ height);}
\DoxyCodeLine{\ \ \ \textcolor{keywordflow}{for}\ (;\ pixels\ <\ pixels\_end;\ pixels++)}
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\DoxyCodeLine{\ \ \ \ \ \ \ \ r\ =\ ((*pixels)\ \&\ 0xff0000)\ >>\ 16;}
\DoxyCodeLine{\ \ \ \ \ \ \ \ g\ =\ ((*pixels)\ \&\ 0x00ff00)\ >>\ 8;}
\DoxyCodeLine{\ \ \ \ \ \ \ \ b\ =\ (*pixels)\ \&\ 0x0000ff;}
\DoxyCodeLine{}
\DoxyCodeLine{\ \ \ \ \ \ \ \ fprintf(f,\ \textcolor{stringliteral}{"{}\%c\%c\%c"{}},\ r,\ g,\ b);}
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\DoxyCodeLine{}
\DoxyCodeLine{\ \ \ fclose(f);}
\DoxyCodeLine{\ \ \ printf(\textcolor{stringliteral}{"{}Saved\ scene\ as\ '\%s'\(\backslash\)n"{}},\ dest);}
\DoxyCodeLine{\}}

\end{DoxyCodeInclude}
 Check that destination file for the result. The full example follows.


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\DoxyCodeLine{}
\DoxyCodeLine{\textcolor{preprocessor}{\#ifdef\ HAVE\_CONFIG\_H}}
\DoxyCodeLine{}
\DoxyCodeLine{\textcolor{preprocessor}{\#include\ "{}config.h"{}}}
\DoxyCodeLine{\textcolor{preprocessor}{\#else}}
\DoxyCodeLine{\textcolor{preprocessor}{\#define\ EINA\_UNUSED}}
\DoxyCodeLine{\textcolor{preprocessor}{\#endif}}
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\DoxyCodeLine{\textcolor{preprocessor}{\#include\ <\mbox{\hyperlink{Ecore__Evas_8h}{Ecore\_Evas.h}}>}}
\DoxyCodeLine{\textcolor{preprocessor}{\#include\ <stdio.h>}}
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\DoxyCodeLine{\textcolor{preprocessor}{\#define\ WIDTH\ \ (320)}}
\DoxyCodeLine{\textcolor{preprocessor}{\#define\ HEIGHT\ (240)}}
\DoxyCodeLine{}
\DoxyCodeLine{\textcolor{keyword}{static}\ Ecore\_Evas\ *ee;}
\DoxyCodeLine{}
\DoxyCodeLine{\textcolor{comment}{/*\ support\ function\ to\ save\ scene\ as\ PPM\ image\ */}}
\DoxyCodeLine{\textcolor{keyword}{static}\ \textcolor{keywordtype}{void}}
\DoxyCodeLine{\_scene\_save(\mbox{\hyperlink{group__Evas__Canvas_ga5ff87cc4ce6bc43e3b640a6d37f73043}{Evas}}\ *canvas,}
\DoxyCodeLine{\ \ \ \ \ \ \ \ \ \ \ \ \textcolor{keyword}{const}\ \textcolor{keywordtype}{char}\ *dest)}
\DoxyCodeLine{\{}
\DoxyCodeLine{\ \ \ \textcolor{keyword}{const}\ \textcolor{keywordtype}{unsigned}\ \textcolor{keywordtype}{int}\ *pixels,\ *pixels\_end;}
\DoxyCodeLine{\ \ \ \textcolor{keywordtype}{int}\ width,\ height;}
\DoxyCodeLine{\ \ \ FILE\ *f;}
\DoxyCodeLine{}
\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Canvas_ga9db9974a647850d7bd49afb506c9717a}{evas\_output\_size\_get}}(canvas,\ \&width,\ \&height);}
\DoxyCodeLine{}
\DoxyCodeLine{\ \ \ f\ =\ fopen(dest,\ \textcolor{stringliteral}{"{}wb+"{}});}
\DoxyCodeLine{\ \ \ \textcolor{keywordflow}{if}\ (!f)}
\DoxyCodeLine{\ \ \ \ \ \{}
\DoxyCodeLine{\ \ \ \ \ \ \ \ fprintf(stderr,\ \textcolor{stringliteral}{"{}ERROR:\ could\ not\ open\ for\ writing\ '\%s':\ \%s\(\backslash\)n"{}},}
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\DoxyCodeLine{\ \ \ pixels\ =\ \mbox{\hyperlink{group__Ecore__Evas__Group_gadb3a75f7fd11a63551573373e5ab30c4}{ecore\_evas\_buffer\_pixels\_get}}(ee);}
\DoxyCodeLine{\ \ \ pixels\_end\ =\ pixels\ +\ (width\ *\ height);}
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\DoxyCodeLine{\ \ \ \textcolor{comment}{/*\ PPM\ P6\ format\ is\ dead\ simple\ to\ write:\ */}}
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\DoxyCodeLine{\ \ \ \textcolor{keywordflow}{for}\ (;\ pixels\ <\ pixels\_end;\ pixels++)}
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\DoxyCodeLine{\ \ \ \ \ \ \ \ \textcolor{keywordtype}{int}\ r,\ g,\ b;}
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\DoxyCodeLine{\ \ \ \ \ \ \ \ b\ =\ (*pixels)\ \&\ 0x0000ff;}
\DoxyCodeLine{}
\DoxyCodeLine{\ \ \ \ \ \ \ \ fprintf(f,\ \textcolor{stringliteral}{"{}\%c\%c\%c"{}},\ r,\ g,\ b);}
\DoxyCodeLine{\ \ \ \ \ \}}
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\DoxyCodeLine{\ \ \ fclose(f);}
\DoxyCodeLine{\ \ \ printf(\textcolor{stringliteral}{"{}Saved\ scene\ as\ '\%s'\(\backslash\)n"{}},\ dest);}
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\DoxyCodeLine{\textcolor{keywordtype}{int}}
\DoxyCodeLine{main(\textcolor{keywordtype}{void})}
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\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Canvas_ga5ff87cc4ce6bc43e3b640a6d37f73043}{Evas}}\ *canvas;}
\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Object__Group_ga9e19e6dd1f517a0ba437c0114d3e7c97}{Evas\_Object}}\ *bg,\ *r1,\ *r2,\ *r3;}
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\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Ecore__Evas__Group_ga32ddbb6457033ad435a177eb0c4fe235}{ecore\_evas\_init}}();}
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\DoxyCodeLine{\ \ \ ee\ =\ \mbox{\hyperlink{group__Ecore__Evas__Group_gab5e52f58b90c0789138f5443f02e23a2}{ecore\_evas\_buffer\_new}}(WIDTH,\ HEIGHT);}
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\DoxyCodeLine{\ \ \ \mbox{\hyperlink{group__Evas__Object__Group__Basic_gab751e9d24c16e74af6f7c08ea5b930c2}{evas\_object\_color\_set}}(bg,\ 255,\ 255,\ 255,\ 255);\ \textcolor{comment}{/*\ white\ bg\ */}}
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\DoxyCodeLine{\ \ \ \textcolor{keywordflow}{return}\ 0;}
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\DoxyCodeLine{error:}
\DoxyCodeLine{\ \ \ fprintf(stderr,\ \textcolor{stringliteral}{"{}error:\ Requires\ at\ least\ one\ Evas\ engine\ built"{}}}
\DoxyCodeLine{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \textcolor{stringliteral}{"{}\ and\ linked\ to\ ecore-\/evas\ for\ this\ example\ to\ run"{}}}
\DoxyCodeLine{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \textcolor{stringliteral}{"{}\ properly.\(\backslash\)n"{}});}
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\DoxyCodeLine{\ \ \ \textcolor{keywordflow}{return}\ -\/1;}
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