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Questions tagged [lexical-cast]

69 questions
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What overhead is there in performing an identity boost::lexical_cast?

Given a function such as: template< typename T > void function1( const T &t ) { function2( boost::lexical_cast(t) ); } What kind of overhead is incurred if the type passed to function1 is already a std::string? Does the overhead…
Drew Dormann
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Stringstream to vector

I'm wondering what the best way to write from an std::stringstream into a vector. Here's an example of what's in the stringstream: "31 #00 532 53 803 33 534 23 37" Here's what I've got: int buffer = 0; vector analogueReadings; stringstream…
Jean-Luc
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Is there a way to use SFINAE to determine if a call to a templated function would fail due to the types provided?

I have a templated class that I am using to provide a method that will use boost::lexical_cast to cast its std::string parameters to the type specified in the template, only if the lexical cast is possible. Currently to check if it's possible I'm…
Cassie Dee
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boost::lexical_cast and stringification of non-builtin types

I have a (maybe) simple problem about boost::lexical_cast with composite types (in my case std::vector. My first version of a templatized stringification function was the following template std::string stringiy(const T…
linello
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Precision is lost when using lexical_cast(string)

When using boost::lexical_cast (I'm using boost version 1.58 on VS2013), I can't get the exact value specified in the string, even though it is represent-able in float: std::wstring t = L"91.25"; float r; r = boost::lexical_cast(t); r is…
omasoud
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boost::lexical_cast cannot handle negative numbers?

This short C++ program behaves in a way which baffles me: #include #include #include #include int main(void) { signed char c = -2; assert(c == -2); c = boost::lexical_cast
quant_dev
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boost lexical cast string to double

I am facing a conversion issue for which I'd like your help. I'm using gcc4 compiler and I am quite restricted to use gcc4. I want to convert std::string to double. std::string aQuantity = aRate.getQuantity(); std::string aAmount =…
user1400995
4
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1 answer

Boost spirit floating number parser precision

There is something strange I noticed when comparing boost::lexical_cast and boost spirit parsing. I'm trying to parse a string into float. for some reason spirit gives very imprecise result. for example: when parsing string "219721.03839999999"…
kreuzerkrieg
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boost::lexical_cast compiles with warnings

Compiling the following: // file main.cpp #include #include int main() { boost::lexical_cast( 656.16 ); return 0; } yields to this: /usr/local/include/boost/lexical_cast.hpp:1184: warning:…
Vahagn
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specializing boost::lexical_cast for enums in boost::property_maps

I am trying to use a boost::graph that has an enum inside its bundled vertex property. The problem starts when I try to use the bundled property for a boost::dynamic_property. Looks like I can't get the correct template specialization for…
Slizzered
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Enable boost::lexical_cast to throw out of range error for values smaller than double range

boost::lexical_cast throws errors for values larger than the maximum value of double. But for numbers smaller than minimum value, it silently makes it zero. How do I enable out of range errors for later case(i.e. If a number is smaller than…
g-217
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How to implement Casts utility namespace

Say I generate a Casts namespace which will hold numerous casts functions: namespace Casts { // To string bool Cast(bool bValue, string& res); bool Cast(int intValue, string& res); bool Cast(float…
idanshmu
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How to use the boost lexical_cast library for just for checking input

I use the boost lexical_cast library for parsing text data into numeric values quite often. In several situations however, I only need to check if values are numeric; I don't actually need or use the conversion. So, I was thinking about writing a…
Inverse
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Convert C++Builder AnsiString to std::string via boost::lexical_cast

For a school assignment I have to implement a project in C++ using Borland C++ Builder. As the VCL uses AnsiString for all GUI Components I have to convert all of my std::strings to AnsiString for the sake of displaying. std::string inp = "Hello…
leen
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Using boost::lexical_cast with custom operator<< in namespace

Given two namespaces which each provide a specialization of operator<< for std::vector, is it possible to use boost::lexical_cast? I know the code will work if I promote one of the operators into the global namespace, but that just causes an…
tgoodhart
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